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日期:2024-09-13
We are NASA's Planetary Science Division. Our hardworking robots explore the planets and more on the wild frontiers of our solar system. What is a Planet? Our Solar System Sun Mercury Venus Earth Earth's Moon Mars Asteroids Meteors & Meteorites Jupiter...
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日期:2024-09-13
The formation of the Solar System is estimated to have begun 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud.[1] Most of the collapsing mass collected in the center, forming the Sun, while the rest flattene...
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日期:2024-09-10
Our solar system consists of a star we call the Sun, the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto; the satellites of the ......
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日期:2024-09-11
A solar system refers to a star and all the objects that travel in orbit around it. Our solar system consists of the sun - our star - eight planets and their natural ......
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日期:2024-09-10
Describes NASA's program to explore the solar system....
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日期:2024-09-09
We are NASA's Planetary Science Division. Our hardworking robots explore the planets and more on the wild frontiers of our solar system....