Cosmic Bruiser
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How not to catch a falling star
Earth’s Moon
Earth and the Moon are more like a double planet than a planet and a moon. The Moon is quite
Pluto
Because it is so far from the Sun, astronomers had a hard time measuring Pluto’s size. They finally got it
Venus
The Venusian clouds kept astronomers from seeing the planet's surface. Without visible landmarks, they could not measure how fast Venus