Introduction of Solar System(太阳系八大行星介绍)

Pluto（冥王星）
In 2006, petite Pluto was stripped of its planet status and downgraded to a dwarf planet. But it’s still on NASA’s radar– the space agency plans to explore Pluto in 2015.
Review
最小的行星——Mercury（水星） 唯一一颗没有磁场的行星——Venus（金星） 自转最快的行星——Jupiter（木星） 密度最小的行星——Saturn（土星）
Review
Mercury（水星） —— Venus（金星） —— Mars（火星） —— Jupiter（木星） —— Saturn（土星） —— Uranus（天王星） —— Neptune（海王星） —— Pluto（冥王星） —— 信使之神 美丽之神 战争之神 爱情之神 大地之神 天空之神 海洋之神 地狱之神
Mars（火星）
Vast networks of canyons and riverbeds on the red planet have led scientists to hypothesize it once supported a wet, warm, Earthlike climate.
Earth（地球）
Earth in its history, Earth looked much like its rocky neighbors Mercury, Venus, and Mars. But its atmosphere, distance from the sun, and countless other variables turned Earth into a haven for life.
Uranus（天王星）
Third of the gas giants from the sun, Uranus appears to glow blue-green in the dim sunlight as methane in its upper atmosphere absorbs red light waves.
Saturn（土星）
Gliding across the night sky, Saturn is among the most graceful sights in the solar system. The earliest telescope observers were dazzled by its rings—once thought to be the only ones among the planets, but not known to be common to all the gas giants.
Hale Waihona Puke SUN（太阳）Every object in the solar system revolves around this ―average‖ star that makes up about 99% of the system’s total mass. Without energy from the sun, life would not be possible on Earth.
Venus（金星）
Venus is similar to Earth in size and mass, but its atmosphere is primarily carbon dioxide. A permanent blanket of clouds traps heat, creating surface temperatures hot enough to melt lead.
Jupiter （木星）
The largest planet in our solar system is the first of the so-called gas giants. Made mostly of hydrogen and helium, Jupiter has no solid surface. Its bands of colorful clouds are created by high-speed jet streams.
Mercury（水星）
With Pluto’s demotion to dwarf planet, Mercury became the solar system’s smallest planet. Its heavily cratered surface resembles that of Earth’s moon.
Neptune（海王星）
The outermost gaseous planet’s blue hue comes from methane in its outer layer, which is also made up of a mixture of heated hydrogen, helium, and water.
Made by Elsa Ren
Solar system
Our solar system is nearly five billion years old. It is made up of planets, dwarf planets, and more than 170 moons, as well as dust, gas, and thousands of asteroids and comets, all orbiting around a central sun.