) of Earth “protects” us from the “wind”.Auroras come about because of the special activities of the sun... “excited” and have a “dance” with the air. So, we can see the moving auroras in the sky. When the “wind ……

different colors?What gives auroras different colors?About 300 to 400 km high in the skyAbout 300 to 400 km...In early May, auroras (极光) showed up in many places, including many parts of China ……

it takes Mars longer than Earth to travel around the sun, which causes longer years on Mars. Besides, Mars and Earth have different sizes and levels of gravity (引力), which make people’s weight change ……

and Earth have different levels of gravity (引力). This makes people’s weight change. Mars takes much more... have many moons. Uranus, for example, has 27.The sun is 100 times bigger than Earth. It is hot ……

: Gravity (重力) is less on Mars than on earth. So someone who weighs 100 pounds here would weigh only 38...?Try the Mars diet:Gravity(重力) is less on Mars than on earth. So someone who weighs 100 pounds here ……

: Gravity (重力) is less on Mars than on earth. So someone who weighs 100 pounds here would weigh only 38...?Try the Mars diet:Gravity(重力) is less on Mars than on earth. So someone who weighs 100 pounds here ……

, but they’re still enough to create auroras. Unlike Earth’s ribbon-like auroras, Mars’ green glow spread... magnetic field, but they’re still enough to create auroras. Unlike Earth’s ribbon-like auroras, Mars ……

in what we can see — the weather here and the weather on Mars. Dust storms on Mars have obscured its... closer to Earth than any planet has been in 50,000 years.This close approach is caused ……

a spacecraft (宇宙飞船) from NASA. On Nov 27, I arrived on Mars. In fact, I have many brothers and sisters here. The Opportunity and Curiosity rovers (火星车) are still working on Mars. I am the eighth ……

and Earth are different in many ways. Mars travels much slower (更慢) around the sun. So it has more days...)! Any other cool things to know about Mars? Follow Teens and have a look!What do you know about ……

, if it happened on Earth, could it have happened on Mars?" said Steve Squyres of Cornell University, New York... on such a planet.Q: How big is Mars?Mars is about half as big as Earth. But because it doesn't have ……

planets have many moons. Uranus (天王星), for example, has 27 moons.The sun is 100 times bigger than Earth... system.Marsand Earth have different sizes and levels of gravity (引力), which make people’s weight change ……

than Mars. If we say Earth is a tennis ball, Mars is a ping-pong ball.Long seasons每个... 3/8 of your weight on Earth. You jump higher. You could jump 3 times (倍数) higher on Mars than you ……

also has valleys (山谷) and volcanoes (火山). Mars and Earth are different as well. Mars doesn’t have...火星到底什么样子？Astronauts have never been to Mars. But robot spacecrafts have. We can learn a lot from ……

;   建议阅读时间    5分钟Have you ever witnessed the astonishing beauty of auroras (极光... (宇宙辐射).Have you ever witnessed the astonishing beauty of auroras (极光)? They are a gift from ……