英语高手来！！！！用英语简短的介绍一下八大行星

用英语简单介绍一下九大行星（八大行星+恒星）！！！！！！！！！！~

Our solar system consists of the sun, nine planets (and their moons), an asteroid belt, and many comets and meteors. The sun is the center of our solar system; the planets, their moons, the asteroids, comets, and other rocks and gas all orbit the sun.

The nine planets that orbit the sun are (in order from the sun): Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. A belt of asteroids (minor planets made of rock and metal) lies between Mars and Jupiter. These objects all orbit the sun in roughly circular orbits that lie in the same plane, the ecliptic (Pluto is an exception; it has an elliptical orbit tilted over 17° from the ecliptic).

Easy ways to remember the order of the planets are the mnemonics: "My Very Excellent Mother Just Sent Us Nine Pizzas" and "My Very Easy Method Just Simplifies Us Naming Planets" The first letter of each of these words represents a planet - in the correct order.



The largest planet is Jupiter. It is followed by Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury, and finally, tiny Pluto. Jupiter is so big that all the other planets could fit inside it.

The Inner Planets vs. the Outer Planets
The inner planets (those planets that orbit close to the sun) are quite different from the outer planets (those planets that orbit far from the sun).
The inner planets are: Mercury, Venus, Earth, and Mars. They are relatively small, composed mostly of rock, and have few or no moons.
The outer planets include: Jupiter, Saturn, Uranus, Neptune, and Pluto. They are mostly huge, mostly gaseous, ringed, and have many moons (again, the exception is Pluto, which is small, rocky, and has one large moon plus two tiny ones).

Temperatures on the Planets
Generally, the farther from the Sun, the cooler the planet. Differences occur when the greenhouse effect warms a planet (like Venus) surrounded by a thick atmosphere.
The outer, gaseous planets are much less dense than the inner, rocky planets.

The Earth is the densest planet. Saturn is the least dense planet; it would float on water.

The Mass of the Planets
Jupiter is by far the most massive planet; Saturn trails it. Uranus, Neptune, Earth, Venus, Mars, and Pluto are orders of magnitude less massive.

Gravitational Forces on the Planets
The planet with the strongest gravitational attraction at its surface is Jupiter. Although Saturn, Uranus, and Neptune are also very massive planets, their gravitational forces are about the same as Earth. This is because the gravitational force a planet exerts upon an object at the planet's surface is proportional to its mass and to the inverse of the planet's radius squared.

A Day on Each of the Planets
A day is the length of time that it takes a planet to rotate on its axis (360°). A day on Earth takes almost 24 hours.

The planet with the longest day is Venus; a day on Venus takes 243 Earth days. (A day on Venus is longer than its year; a year on Venus takes only 224.7 Earth days).

The planet with the shortest day is Jupiter; a day on Jupiter only takes 9.8 Earth hours! When you observe Jupiter from Earth, you can see some of its features change.

The Average Orbital Speed of the Planets
As the planets orbit the Sun, they travel at different speeds. Each planet speeds up when it is nearer the Sun and travels more slowly when it is far from the Sun (this is Kepler's Second Law of Planetary Motion).


链接的网址还有图片对照
参考资料：http://www.enchantedlearning.com/subjects/astronomy/planets/

Mercury (水星) Venus (金星) Earth (地球) Mars （火星） Jupiter (木星) Saturn (土星) Uranus（天王星） Neptune （海王星） Pluto（冥王星） Sedna（第10大行星）
参考资料：http://www.enchantedlearning.com/subjects/astronomy/planets/

Mercury (水星):
——The Mercury is the smallest of the planets and the one nearest the sun, having a sidereal period of revolution about the sun of 88 days (水星是行星中最小且离太阳最近的星，围绕太阳公转所需的周期为88天。)

Mars (火星):
——The Mars is the fourth planet from the sun, having a sidereal period of revolution about the sun of 687 days. (火星是距太阳距离居第四位的行星，绕太阳公转周期为687天，).

Venus (金星):
——The Hesper is the planet Venus in its appearance. The Venus is the second planet from the sun, having a mass 0.815 times that of Earth, and a sidereal period of revolution about the sun of 224.7 days. When appearing as the evening star, it can be called Hesper/Hesperus. (金星是离太阳第二远的行星，它的质量是地球质量的0.815倍，绕太阳转的公转周期为224.7天。傍晚出现时称作长庚星)

Saturn (土星):
——
It is the sixth planet from the sun and the second largest in the solar system, having a sidereal period of revolution about the sun of 29.5 years and a mass 95 times that of Earth. (土星是距太阳第六远的行星，是太阳系中第二大行星，绕日公转周期29.5年，质量是地球的95倍。)

Jupiter (木星):
——
The Jupiter is the fifth planet from the sun, the largest and most massive in the solar system, having a sidereal period of revolution about the sun of 11.86 years. (木星是靠近太阳的第5颗行星，也是太阳系中最大的行星，绕太阳公转的恒星期为11.86年。)

Uranus (天王星):
——
The Uranus is the seventh planet from the sun, revolving about it every 84.07 years. (是离太阳第七近的行星，每绕太阳一周为84.07年。)

Neptune (海王星):
——
The Neptune is the eighth planet from the sun, having a sidereal period of revolution around the sun of 164.8 years.（是太阳的第八颗行星。围绕太阳公转的恒星周期为164.8年）

Pluto (冥王星):
——
The Pluto used to be the ninth planet in the solar system, but now it is listed as the Dwarf Planet. （冥王星曾经是太阳系的第九颗行星，但是现在被列为矮行星。）

Mercury
Mercury 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.
Venus
The 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.
Mars
Mars, 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.
Jupiter
Further 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.
Saturn
Saturn, 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.
Uranus
While 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.
Neptune
The 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”

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