漳南一邺
MercuryMercury is the closest planet to the sun. Its cratered surface can reach upwards of 800 degrees fahrenheit because of its proximity to the sun and its slow rotation. Only slightly larger than Earth's moon, it is the smallest planet in the solar system. It has no moons, no rings, and a very thin atmosphere.VenusThe second planet from the sun, Venus, is slightly smaller than Earth. Because of its relative proximity to Earth, it is the largest planet seen in the night sky. The cratered surface of the planet is hot, with surface temperatures around 900 degrees fahrenheit. Venus has a thick atmosphere of sulfuric acid and carbon dioxide. The density of its atmosphere makes the air pressure 90 times that of Earth's. This makes the planet decidedly inhospitable to life.MarsMars, also called the Red Planet, is the solar system's fourth planet. Its surface is characterized by dust storms, large volcanoes and deep valleys. The red color of the surface comes from iron oxide or rust in the soil. Some of the surface features of Mars, such as dry river beds, hint toward water previously existing on the planet. The atmosphere is very thin on Mars, with only 1/100th the air pressure of Earth, and the planet is relatively cold with surface temperatures ranging from -171 to 32 degrees fahrenheit.JupiterFurther from the sun, past a ring of asteroids, lies the largest planet in our solar system -- Jupiter -- the first of the gas giant planets. Its characteristic colored cloud patterns are caused by enormous, swirling storms in its atmosphere. The largest and most distinctive of these, the Great Red Spot, is large enough to swallow Earth. The interior of this great planet is mostly hydrogen and helium. Jupiter has 63 moons and a faint ring system.SaturnSaturn, the sixth planet from the sun and the second gas giant, is unique in that an extensive and complex set of rings orbit the planet in a thin band. Saturn is large -- about 9.5 times the radius of Earth. It has 62 moons in its orbit. The interior of Saturn, like Jupiter, is made of mostly hydrogen and helium in liquid form because of the strong pressure there.UranusWhile most planets spin on their axis with a slight tilt, the gas giant Uranus spins on a plane with the orbit of the sun. This creates unique seasonal changes. This cold planet is four times the diameter of Earth, and is made of a large atmosphere of methane with a dense core of frozen methane. Uranus has a faint ring system and 27 moons in its orbit.NeptuneThe blue planet Neptune is the farthest from the sun and, like Uranus, is a very cold place. Because of its distance from the sun, one year on Neptune is 165 Earth years. The large amount of methane in the atmosphere gives the planet its blue color, and the cold interior of the planet is mainly methane ice. It is a relatively large planet. Also like Uranus, it has a diameter roughly four times that of Earth. Thirteen moons and a faint ring system orbit the planet.需要说明的是，8大行星里没有冥王星，因为在2006年8月24日召开的国际天文学联合会第26届大会，经两千余天文学家表决通过———太阳系只有八大行星。不再将传统九大行星之一的冥王星视为行星，而将其列入“矮行星”
全能小吃货
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[6] prevalent on its surface. Mars is a terrestrial planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the volcanoes, valleys, deserts and polar ice caps of Earth. Unlike the Earth, Mars is now a geologically inactive planet with no known tectonic activity. It is the site of Olympus Mons, the highest known mountain in the Solar System, and of Valles Marineris, the largest canyon. The smooth Borealis basin in the northern hemisphere may be a giant impact feature covering 40% of the planet.[7][8] Mars’ rotational period and seasonal cycles are likewise similar to those of Earth.Until the first flyby of Mars by Mariner 4 in 1965, many speculated that there might be liquid water on the planet's surface. This was based on observed periodic variations in light and dark patches, particularly in the polar latitudes, which looked like seas and continents, while long, dark striations were interpreted by some as irrigation channels for liquid water. These straight line features were later explained as optical illusions. Still, of all the planets in the Solar System other than Earth, Mars is the most likely to harbor liquid water, and thus may contain life.[9] Geological evidence gathered by unmanned missions suggests that Mars once had large-scale water coverage on its surface, while small geyser-like water flows may have occurred during the past decade.[10] In 2005, radar data revealed the presence of large quantities of water ice at the poles[11] and at mid-latitudes (November 2008).[12] The Phoenix Mars Lander directly sampled water ice in shallow martian soil on July 31, 2008.[13]Mars has two moons, Phobos and Deimos, which are small and irregularly shaped. These may be captured asteroids, similar to 5261 Eureka, a Martian Trojan asteroid. Mars can be seen from Earth with the naked eye. Its apparent magnitude reaches −2.91,[5] a brightness surpassed only by Venus, the Moon, and the Sun, although most of the time Jupiter will appear brighter to the naked eye than Mars. Mars has an average opposition distance of 78 million km but can come as close as 55.7 million km during a close approach, such as occurred in 2003.[5]Mars is currently host to three functional orbiting spacecraft: Mars Odyssey, Mars Express, and the Mars Reconnaissance Orbiter. On the surface are the two Mars Exploration Rovers (Spirit and Opportunity) and several inert landers and rovers, both successful and unsuccessful. The Phoenix lander completed its mission on the surface in 2008. Observations by NASA's now-defunct Mars Global Surveyor show evidence that parts of the southern polar ice cap have been receding
密果儿小YO
火星（Mars）是太阳系八大行星之一，是太阳系由内往外数的第四颗行星，属于类地行星，直径约为地球的一半，自转轴倾角、自转周期均与地球相近，公转一周约为地球公转时间的两倍。在西方称为“战神玛尔斯”，中国则称为“荧惑”。橘红色外表是因为地表的赤铁矿（氧化铁）。火星基本上是沙漠行星，地表沙丘、砾石遍布，没有稳定的液态水体。二氧化碳为主的大气既稀薄又寒冷，沙尘悬浮其中，每年常有尘暴发生。火星两极皆有水冰与干冰组成的极冠，会随着季节消长。中文名： 火星 外文名： Mars 别名： 荧惑星 自转周期： 24小时37分22秒 公转周期： 686.98天 距太阳距离： 22794万千米 质量：
朵朵陌上花
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.Mars is a terrestrial planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the volcanoes, valleys, deserts and polar ice caps of Earth. It is the site of Olympus Mons, the highest known mountain in the Solar System, and of Valles Marineris, the largest canyon. Furthermore, in June 2008 three articles published in Nature presented evidence of an enormous impact crater in Mars's northern hemisphere, 10,600 km long by 8,500 km wide, or roughly four times larger than the largest impact crater yet discovered, the Moon's South Pole-Aitken basin. In addition to its geographical features, Mars’ rotational period and seasonal cycles are likewise similar to those of Earth.
