الثلاثاء، 29 ديسمبر 2009
الأربعاء، 23 ديسمبر 2009
Mercury
Mercury
Mercury is the innermost and smallest planet in the Solar System, orbiting the Sun once every 88 days , and orbiting around himself in 176 days , The orbit of Mercury has the highest eccentricity of all the Solar System planets, and it has the smallest axial tilt. It completes three rotations about the axis for every two orbits . Mercury planet is 58 million KM Away from the sun. His high temperature is (465) degrees C) and the micro is (-184). His mean radius is about 2439 KM , and his Gravity is about 3.7 , they discovered mercury in 1974.
Comparatively little is known about Mercury; ground-based telescopes reveal only an illuminated crescent with limited detail. The first of two spacecraft to visit the planet was Mariner 10, which mapped only about 45% of the planet’s surface from 1974 to 1975. The second is the MESSENGER spacecraft, which mapped another 30% during its flyby of January 14, 2008. A final flyby took place in September 2009. MESSENGER is scheduled to attain orbital insertion around Mercury in 2011, and will then survey and map the entire planet.
Greek astronomers believed the planet to be two separate objects: one visible only at sunrise, which they called Apollo; the other visible only at sunset, which they called Hermes. The English name for the planet comes from the Romans, who named it after the Roman god Mercury, which they equated with the Greek Hermes(Ἑρμῆς). The astronomical symbol for Mercury is a stylized version of Hermes' caduceus.
Mercury’s apparent magnitude varies between about −2.3—brighter than Sirius—and 5.7, with the extremes being when Mercury is very close to the Sun in the sky.[8] Observation of Mercury is complicated by its proximity to the Sun, as it is lost in the Sun’s glare for much of the time. Mercury can be observed for only a brief period during either morning or evening twilight. The Hubble Space Telescope cannot observe Mercury at all, due to safety procedures which prevent its pointing too close to the Sun.
Mercury is the innermost and smallest planet in the Solar System, orbiting the Sun once every 88 days , and orbiting around himself in 176 days , The orbit of Mercury has the highest eccentricity of all the Solar System planets, and it has the smallest axial tilt. It completes three rotations about the axis for every two orbits . Mercury planet is 58 million KM Away from the sun. His high temperature is (465) degrees C) and the micro is (-184). His mean radius is about 2439 KM , and his Gravity is about 3.7 , they discovered mercury in 1974.
Comparatively little is known about Mercury; ground-based telescopes reveal only an illuminated crescent with limited detail. The first of two spacecraft to visit the planet was Mariner 10, which mapped only about 45% of the planet’s surface from 1974 to 1975. The second is the MESSENGER spacecraft, which mapped another 30% during its flyby of January 14, 2008. A final flyby took place in September 2009. MESSENGER is scheduled to attain orbital insertion around Mercury in 2011, and will then survey and map the entire planet.
Greek astronomers believed the planet to be two separate objects: one visible only at sunrise, which they called Apollo; the other visible only at sunset, which they called Hermes. The English name for the planet comes from the Romans, who named it after the Roman god Mercury, which they equated with the Greek Hermes(Ἑρμῆς). The astronomical symbol for Mercury is a stylized version of Hermes' caduceus.
Mercury’s apparent magnitude varies between about −2.3—brighter than Sirius—and 5.7, with the extremes being when Mercury is very close to the Sun in the sky.[8] Observation of Mercury is complicated by its proximity to the Sun, as it is lost in the Sun’s glare for much of the time. Mercury can be observed for only a brief period during either morning or evening twilight. The Hubble Space Telescope cannot observe Mercury at all, due to safety procedures which prevent its pointing too close to the Sun.
Earth
Earth
Earth (or the Earth) is the third planet from the Sun, and the fifth-largest of the eight planets in the Solar System. It is also the largest, most massive, and densest of the Solar System's four terrestrial (or rocky) planets. It is sometimes referred to as the World, the Blue Planet or Terra .
Home to millions of species, including humans, Earth is the only place in the universe where life is known to exist. The planet formed 4.54 billion years ago, and life appeared on its surface within a billion years. Since then, Earth's biosphere has significantly altered the atmosphere and other abiotic conditions on the planet, enabling the proliferation of aerobic organisms as well as the formation of the ozone layer which, together with Earth's magnetic field, blocks harmful radiation, permitting life on land. The physical properties of the Earth, as well as its geological history and orbit, allowed life to persist during this period .
Earth's outer surface is divided into several rigid segments, or tectonic plates, that gradually migrate across the surface over periods of many millions of years. About 71% of the surface is covered with salt-water oceans, the remainder consisting of continents and islands; liquid water, necessary for all known life, is not known to exist on any other planet's surface. Earth's interior remains active, with a thick layer of relatively solid mantle, a liquid outer core that generates a magnetic field, and a solid iron inner core.
At present, Earth provides the only example of an environment that has given rise to the evolution of life. Highly energetic chemistry is believed to have produced a self-replicating molecule around 4 billion years ago, and half a billion years later the last common ancestor of all life existed. The development of photosynthesis allowed the Sun's energy to be harvested directly by life forms; the resultant oxygen accumulated in the atmosphere and formed in a layer of ozone (a form of molecular oxygen [O3]) in the upper atmosphere. The incorporation of smaller cells within larger ones resulted
The earth is 149,6 million KM Away from the sun. His average temperature 14 degree . His mean radius is about 6372 KM , and his Gravity is about 9.8 , orbiting the Sun once every 365,4 days , and orbiting around himself in 24 hour. And it has one moon .
Earth (or the Earth) is the third planet from the Sun, and the fifth-largest of the eight planets in the Solar System. It is also the largest, most massive, and densest of the Solar System's four terrestrial (or rocky) planets. It is sometimes referred to as the World, the Blue Planet or Terra .
Home to millions of species, including humans, Earth is the only place in the universe where life is known to exist. The planet formed 4.54 billion years ago, and life appeared on its surface within a billion years. Since then, Earth's biosphere has significantly altered the atmosphere and other abiotic conditions on the planet, enabling the proliferation of aerobic organisms as well as the formation of the ozone layer which, together with Earth's magnetic field, blocks harmful radiation, permitting life on land. The physical properties of the Earth, as well as its geological history and orbit, allowed life to persist during this period .
Earth's outer surface is divided into several rigid segments, or tectonic plates, that gradually migrate across the surface over periods of many millions of years. About 71% of the surface is covered with salt-water oceans, the remainder consisting of continents and islands; liquid water, necessary for all known life, is not known to exist on any other planet's surface. Earth's interior remains active, with a thick layer of relatively solid mantle, a liquid outer core that generates a magnetic field, and a solid iron inner core.
At present, Earth provides the only example of an environment that has given rise to the evolution of life. Highly energetic chemistry is believed to have produced a self-replicating molecule around 4 billion years ago, and half a billion years later the last common ancestor of all life existed. The development of photosynthesis allowed the Sun's energy to be harvested directly by life forms; the resultant oxygen accumulated in the atmosphere and formed in a layer of ozone (a form of molecular oxygen [O3]) in the upper atmosphere. The incorporation of smaller cells within larger ones resulted
The earth is 149,6 million KM Away from the sun. His average temperature 14 degree . His mean radius is about 6372 KM , and his Gravity is about 9.8 , orbiting the Sun once every 365,4 days , and orbiting around himself in 24 hour. And it has one moon .
Venus
Venus
Venus is the second-closest planet to the Sun, orbiting it every 224.7 days. The planet is named after Venus, the Roman goddess of love and beauty . After the Moon, it is the brightest natural object in the night sky, reaching an apparent magnitude of −4.6 . Because Venus is an inferior planet from Earth, it never appears to venture far from the Sun: its elongation reaches a maximum of 47.8°. Venus reaches its maximum brightness shortly before sunrise or shortly after sunset, for which reason it is often called the Morning Star or the Evening Star.
Venus's surface was a subject of speculation until some of its secrets were revealed by planetary science in the twentieth century. It was finally mapped in detail by Project Magellan in 1990–91. The ground shows evidence of extensive volcanism, and the sulfur in the atmosphere may indicate that there have been some recent eruptions.[10][11] However, the absence of evidence of lava flow accompanying any of the visible caldera remains an enigma. The planet has few impact craters, demonstrating that the surface is relatively young, approximately half a billion years old.[12] There is no evidence for plate tectonics, possibly because its crust is too strong to subduct without water to make it less viscous. Instead, Venus may lose its internal heat in periodic massive resurfacing events .
venus planet is 108.2 million KM Away from the sun his temperature Average is 449 degrees , and his mean radius is about 6052 KM , and his Gravity is about 8.87.
The first robotic space probe mission to Venus, and the first to any planet, began on February 12, 1961 with the launch of the Venera 1 probe. The first craft of the otherwise highly successful Soviet Venera program, Venera 1 was launched on a direct impact trajectory, but contact was lost seven days into the mission, when the probe was about 2 million km from Earth. It was estimated to have passed within 100,000 km from Venus in mid-May.
Venus is the second-closest planet to the Sun, orbiting it every 224.7 days. The planet is named after Venus, the Roman goddess of love and beauty . After the Moon, it is the brightest natural object in the night sky, reaching an apparent magnitude of −4.6 . Because Venus is an inferior planet from Earth, it never appears to venture far from the Sun: its elongation reaches a maximum of 47.8°. Venus reaches its maximum brightness shortly before sunrise or shortly after sunset, for which reason it is often called the Morning Star or the Evening Star.
Venus's surface was a subject of speculation until some of its secrets were revealed by planetary science in the twentieth century. It was finally mapped in detail by Project Magellan in 1990–91. The ground shows evidence of extensive volcanism, and the sulfur in the atmosphere may indicate that there have been some recent eruptions.[10][11] However, the absence of evidence of lava flow accompanying any of the visible caldera remains an enigma. The planet has few impact craters, demonstrating that the surface is relatively young, approximately half a billion years old.[12] There is no evidence for plate tectonics, possibly because its crust is too strong to subduct without water to make it less viscous. Instead, Venus may lose its internal heat in periodic massive resurfacing events .
venus planet is 108.2 million KM Away from the sun his temperature Average is 449 degrees , and his mean radius is about 6052 KM , and his Gravity is about 8.87.
The first robotic space probe mission to Venus, and the first to any planet, began on February 12, 1961 with the launch of the Venera 1 probe. The first craft of the otherwise highly successful Soviet Venera program, Venera 1 was launched on a direct impact trajectory, but contact was lost seven days into the mission, when the probe was about 2 million km from Earth. It was estimated to have passed within 100,000 km from Venus in mid-May.
Mars
Mars
Mars is the fourth planet from the Sun in the Solar System. The planet is named after Mars, the Roman god of war. It is also referred to as the "Red Planet" because of its reddish appearance, due to iron oxide prevalent on its surface . Scientists believe that the water was in mars before 3.8 billions year
NASA do some mission for mars , and The first successful fly-by mission to Mars was NASA's Mariner 4, launched in 1964. On November 14, 1971 Mariner 9 became the first space probe to orbit another planet when it entered into orbit around Mars. The first successful objects to land on the surface were two Soviet probes . and on 1975 NASA has launches of the Viking program, which consisted of two orbiters, each having a lander; both landers successfully touched down in 1976. Viking 1 remained operational for six years, Viking 2 for three. The Viking landers relayed color panoramas of Mars[100] and the orbiters mapped the surface so well that the images remain in use . The last recent mission to Mars was the NASA Phoenix Mars lander, which launched August 4, 2007 and arrived on the north polar region of Mars on May 25, 2008 , they discovered a substance at its landing site on June 15, 2008, which was confirmed to be water ice , The mission was declared concluded on November 10, 2008 .
In the future , the Manned Mars exploration by the United States has been explicitly identified as a long-term goal in the Vision for Space Exploration announced in 2004 by the then US President George W. Bush.[117] NASA and Lockheed Martin have begun work on the Orion spacecraft, formerly the Crew Exploration Vehicle, which is currently scheduled to send a human expedition to Earth's moon by 2020 as a stepping stone to an expedition to Mars thereafter. On September 28, 2007, NASA administrator Michael D. Griffin stated that NASA aims to put a man on Mars by 2037 .
The mars mean radius is about 3397 KM and its equal the half diameter of the earth , and its 227.9 million KM away from the sun , and his gravity is 3.71, he has two moon , deimos and phobos , . His high temperature is (27) degrees C) and the micro is (-133) .
Mars is the fourth planet from the Sun in the Solar System. The planet is named after Mars, the Roman god of war. It is also referred to as the "Red Planet" because of its reddish appearance, due to iron oxide prevalent on its surface . Scientists believe that the water was in mars before 3.8 billions year
NASA do some mission for mars , and The first successful fly-by mission to Mars was NASA's Mariner 4, launched in 1964. On November 14, 1971 Mariner 9 became the first space probe to orbit another planet when it entered into orbit around Mars. The first successful objects to land on the surface were two Soviet probes . and on 1975 NASA has launches of the Viking program, which consisted of two orbiters, each having a lander; both landers successfully touched down in 1976. Viking 1 remained operational for six years, Viking 2 for three. The Viking landers relayed color panoramas of Mars[100] and the orbiters mapped the surface so well that the images remain in use . The last recent mission to Mars was the NASA Phoenix Mars lander, which launched August 4, 2007 and arrived on the north polar region of Mars on May 25, 2008 , they discovered a substance at its landing site on June 15, 2008, which was confirmed to be water ice , The mission was declared concluded on November 10, 2008 .
In the future , the Manned Mars exploration by the United States has been explicitly identified as a long-term goal in the Vision for Space Exploration announced in 2004 by the then US President George W. Bush.[117] NASA and Lockheed Martin have begun work on the Orion spacecraft, formerly the Crew Exploration Vehicle, which is currently scheduled to send a human expedition to Earth's moon by 2020 as a stepping stone to an expedition to Mars thereafter. On September 28, 2007, NASA administrator Michael D. Griffin stated that NASA aims to put a man on Mars by 2037 .
The mars mean radius is about 3397 KM and its equal the half diameter of the earth , and its 227.9 million KM away from the sun , and his gravity is 3.71, he has two moon , deimos and phobos , . His high temperature is (27) degrees C) and the micro is (-133) .
Saturn
Saturn
Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Saturn, along with Jupiter, Uranus and Neptune, is classified as a gas giant . Together, these four planets are sometimes referred to as the Jovian, meaning "Jupiter-like" . Saturn is named after the Roman god Saturn , and Saturn is symbol represents the god's sickle . Saturn's feature that it has a loops from ice and dust orbit around it in one level which give it a distinctive form .
Saturn is probably best known for its system of planetary rings, which makes it the most visually remarkable object in the solar system. They extend from 6 630 km to 120 700 km above Saturn's equator, average approximately 20 meters in thickness, and are composed of 93 percent water ice with a smattering of tholin impurities, and 7 percent amorphous carbon. The particles that make up the rings range in size from specks of dust to the size of a small automobile. There are two main theories regarding the origin of Saturn's rings. One theory is that the rings are remnants of a destroyed moon of Saturn. The second theory is that the rings are left over from the original nebular material from which Saturn formed.
It's 1,426 billion KM away from the sun , and it has 60 moon , and his mean radius is 60,267 KM , and the gravity is 8.96 . and the surface area is 44 billion 〖KM〗^2
Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Saturn, along with Jupiter, Uranus and Neptune, is classified as a gas giant . Together, these four planets are sometimes referred to as the Jovian, meaning "Jupiter-like" . Saturn is named after the Roman god Saturn , and Saturn is symbol represents the god's sickle . Saturn's feature that it has a loops from ice and dust orbit around it in one level which give it a distinctive form .
Saturn is probably best known for its system of planetary rings, which makes it the most visually remarkable object in the solar system. They extend from 6 630 km to 120 700 km above Saturn's equator, average approximately 20 meters in thickness, and are composed of 93 percent water ice with a smattering of tholin impurities, and 7 percent amorphous carbon. The particles that make up the rings range in size from specks of dust to the size of a small automobile. There are two main theories regarding the origin of Saturn's rings. One theory is that the rings are remnants of a destroyed moon of Saturn. The second theory is that the rings are left over from the original nebular material from which Saturn formed.
It's 1,426 billion KM away from the sun , and it has 60 moon , and his mean radius is 60,267 KM , and the gravity is 8.96 . and the surface area is 44 billion 〖KM〗^2
Jupiter
Jupiter
Jupiter is the fifth planet from the Sun in the Solar System. and it’s the largest planet in the solar system . his mass is bigger more than 2.5 times the other eight planets combined . The Romans named the planet after the Roman god Jupiter ,and it's the third-brightest object in the night sky after the Moon and Venus .
Jupiter is thought to consist of a dense core with a mixture of elements, a surrounding layer of liquid metallic hydrogen with some helium, and an outer layer predominantly of molecular hydrogen.[27] Beyond this basic outline, there is still considerable uncertainty. The core is often described as rocky, but its detailed composition is unknown, as are the properties of materials at the temperatures and pressures of those depths (see below). In 1997, the existence of the core was suggested by gravitational measurements, indicating a mass of from 12 to 45 times the Earth's mass or roughly 3%–15% of the total mass of Jupiter. The presence of a core during at least part of Jupiter's history is suggested by models of planetary formation involving initial formation of a rocky or icy core that is massive enough to collect its bulk of hydrogen and helium from the protosolar nebula. Assuming it did exist, it may have shrunk as convection currents of hot liquid metallic hydrogen mixed with the molten core and carried its contents to higher levels in the planetary interior. A core may now be entirely absent, as gravitational measurements are not yet precise enough to rule that possibility out entirely
The jupiter mean radius is about 71,492 KM, and its 778.4 million KM away from the sun , and his gravity is 23.12. it has 63 moon,so it makes it the most planen has a moons in the solar system . his surface area is about 64 billion 〖KM〗^2 .
Jupiter is the fifth planet from the Sun in the Solar System. and it’s the largest planet in the solar system . his mass is bigger more than 2.5 times the other eight planets combined . The Romans named the planet after the Roman god Jupiter ,and it's the third-brightest object in the night sky after the Moon and Venus .
Jupiter is thought to consist of a dense core with a mixture of elements, a surrounding layer of liquid metallic hydrogen with some helium, and an outer layer predominantly of molecular hydrogen.[27] Beyond this basic outline, there is still considerable uncertainty. The core is often described as rocky, but its detailed composition is unknown, as are the properties of materials at the temperatures and pressures of those depths (see below). In 1997, the existence of the core was suggested by gravitational measurements, indicating a mass of from 12 to 45 times the Earth's mass or roughly 3%–15% of the total mass of Jupiter. The presence of a core during at least part of Jupiter's history is suggested by models of planetary formation involving initial formation of a rocky or icy core that is massive enough to collect its bulk of hydrogen and helium from the protosolar nebula. Assuming it did exist, it may have shrunk as convection currents of hot liquid metallic hydrogen mixed with the molten core and carried its contents to higher levels in the planetary interior. A core may now be entirely absent, as gravitational measurements are not yet precise enough to rule that possibility out entirely
The jupiter mean radius is about 71,492 KM, and its 778.4 million KM away from the sun , and his gravity is 23.12. it has 63 moon,so it makes it the most planen has a moons in the solar system . his surface area is about 64 billion 〖KM〗^2 .
Uranus
Uranus
Uranus is the seventh planet from the Sun, and the third-largest and fourth most massive planet in the Solar System. It is named after the ancient Greek deity of the sky Uranus . Though it is visible to the naked eye like the five classical planets, it was never recognized as a planet by ancient observers because of its dimness and slow orbit , but after that Sir William Herschel announced its discovery on March 13, 1781 .
Although there is no well-defined solid surface within Uranus's interior, the outermost part of Uranus's gaseous envelope that is accessible to remote sensing is called its atmosphere.[12] Remote sensing capability extends down to roughly 300 km below the 1 bar (100 kPa) level, with a corresponding pressure around 100 bar (10 MPa) and temperature of 320 K.[62] The tenuous corona of the atmosphere extends remarkably over two planetary radii from the nominal surface at 1 bar pressure.[63] The Uranian atmosphere can be divided into three layers: the troposphere, between altitudes of −300 and 50 km and pressures from 100 to 0.1 bar; (10 MPa to 10 kPa), the stratosphere, spanning altitudes between 50 and 4000 km and pressures of between 0.1 and 10–10 bar (10 kPa to 10 µPa), and the thermosphere/corona extending from 4,000 km to as high as 50,000 km from the surface. There is no mesosphere.
His surface area is about 8.1 billion 〖KM〗^2, and its 2.87 billion KM away from the sun , and his mean radius is 25,557 KM , it has 27 moon , and the gravity is 8.69 , and its circle around the sun in 82 year .
Uranus is the seventh planet from the Sun, and the third-largest and fourth most massive planet in the Solar System. It is named after the ancient Greek deity of the sky Uranus . Though it is visible to the naked eye like the five classical planets, it was never recognized as a planet by ancient observers because of its dimness and slow orbit , but after that Sir William Herschel announced its discovery on March 13, 1781 .
Although there is no well-defined solid surface within Uranus's interior, the outermost part of Uranus's gaseous envelope that is accessible to remote sensing is called its atmosphere.[12] Remote sensing capability extends down to roughly 300 km below the 1 bar (100 kPa) level, with a corresponding pressure around 100 bar (10 MPa) and temperature of 320 K.[62] The tenuous corona of the atmosphere extends remarkably over two planetary radii from the nominal surface at 1 bar pressure.[63] The Uranian atmosphere can be divided into three layers: the troposphere, between altitudes of −300 and 50 km and pressures from 100 to 0.1 bar; (10 MPa to 10 kPa), the stratosphere, spanning altitudes between 50 and 4000 km and pressures of between 0.1 and 10–10 bar (10 kPa to 10 µPa), and the thermosphere/corona extending from 4,000 km to as high as 50,000 km from the surface. There is no mesosphere.
His surface area is about 8.1 billion 〖KM〗^2, and its 2.87 billion KM away from the sun , and his mean radius is 25,557 KM , it has 27 moon , and the gravity is 8.69 , and its circle around the sun in 82 year .
Neptune
Neptune
Neptune is the eighth planet from the Sun in our Solar System. Named for the Roman god of the sea, it is the fourth-largest planet by diameter and the third-largest by mass. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus . It Discovered on September 23, 1846,[1] Neptune was the first planet found by mathematical prediction rather than by empirical observation . Neptune is similar in composition to Uranus , and Astronomers sometimes categorize Uranus and Neptune as "ice giants" .
In 1989, the Great Dark Spot, an anti-cyclonic storm system spanning 13000×6600 km, was discovered by NASA's Voyager 2 spacecraft. The storm resembled the Great Red Spot of Jupiter. Some five years later, however, on November 2, 1994, the Hubble Space Telescope did not see the Great Dark Spot on the planet. Instead, a new storm similar to the Great Dark Spot was found in the planet's northern hemisphere .
Neptune's dark spots are thought to occur in the troposphere at lower altitudes than the brighter cloud features, so they appear as holes in the upper cloud decks. As they are stable features that can persist for several months, they are thought to be vortex structures. Often associated with dark spots are brighter, persistent methane clouds that form around the tropopause layer. The persistence of companion clouds shows that some former dark spots may continue to exist as cyclones even though they are no longer visible as a dark feature. Dark spots may dissipate when they migrate too close to the equator or possibly through some other unknown mechanism
His surface area is about 7.7 billion 〖KM〗^2 , its 4.498 billion away from the sun , it has 13 moon , and his gravity is about 11 , and his mean radius is about 24,766 KM . its circle around the sun in 164.7 year .
Neptune is the eighth planet from the Sun in our Solar System. Named for the Roman god of the sea, it is the fourth-largest planet by diameter and the third-largest by mass. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus . It Discovered on September 23, 1846,[1] Neptune was the first planet found by mathematical prediction rather than by empirical observation . Neptune is similar in composition to Uranus , and Astronomers sometimes categorize Uranus and Neptune as "ice giants" .
In 1989, the Great Dark Spot, an anti-cyclonic storm system spanning 13000×6600 km, was discovered by NASA's Voyager 2 spacecraft. The storm resembled the Great Red Spot of Jupiter. Some five years later, however, on November 2, 1994, the Hubble Space Telescope did not see the Great Dark Spot on the planet. Instead, a new storm similar to the Great Dark Spot was found in the planet's northern hemisphere .
Neptune's dark spots are thought to occur in the troposphere at lower altitudes than the brighter cloud features, so they appear as holes in the upper cloud decks. As they are stable features that can persist for several months, they are thought to be vortex structures. Often associated with dark spots are brighter, persistent methane clouds that form around the tropopause layer. The persistence of companion clouds shows that some former dark spots may continue to exist as cyclones even though they are no longer visible as a dark feature. Dark spots may dissipate when they migrate too close to the equator or possibly through some other unknown mechanism
His surface area is about 7.7 billion 〖KM〗^2 , its 4.498 billion away from the sun , it has 13 moon , and his gravity is about 11 , and his mean radius is about 24,766 KM . its circle around the sun in 164.7 year .
Pluto
Pluto
Pluto is a dwarf planet , it's away from the sun so we can just see it as a star yoke , The Romans was think that the god Pluto is the god of the underworld which is equivalent the word "Hades" , which means "unknown origin", it was the ninth and the smallest planet in the solar system , But the International Astronomical Union has re-definition from "planet" in August /24/2006 , to one of the " dwarf planets" . and at 2008 they expelled Pluto from the solar system because they say its circle around other star .
Pluto's orbit is different from those of the planets. The planets all orbit the Sun close to a flat reference plane called the ecliptic and have nearly circular orbits. In contrast, Pluto's orbit is highly inclined relative to the ecliptic (over 17°) and highly eccentric (elliptical). This high eccentricity leads to a small region of Pluto's orbit lying closer to the Sun than Neptune's
The Pluto diameter is about 2300 KM, and the average space between him and the sun is about 5.9 billion KM , and the temperature on the surface is (-230)C ,and the time for Pluto to circle around itself is 18 hour and 26 minute.
Pluto is a dwarf planet , it's away from the sun so we can just see it as a star yoke , The Romans was think that the god Pluto is the god of the underworld which is equivalent the word "Hades" , which means "unknown origin", it was the ninth and the smallest planet in the solar system , But the International Astronomical Union has re-definition from "planet" in August /24/2006 , to one of the " dwarf planets" . and at 2008 they expelled Pluto from the solar system because they say its circle around other star .
Pluto's orbit is different from those of the planets. The planets all orbit the Sun close to a flat reference plane called the ecliptic and have nearly circular orbits. In contrast, Pluto's orbit is highly inclined relative to the ecliptic (over 17°) and highly eccentric (elliptical). This high eccentricity leads to a small region of Pluto's orbit lying closer to the Sun than Neptune's
The Pluto diameter is about 2300 KM, and the average space between him and the sun is about 5.9 billion KM , and the temperature on the surface is (-230)C ,and the time for Pluto to circle around itself is 18 hour and 26 minute.
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