danger from the sky
By 18732063, Updated
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the craters that cover much of the moon's surface were caused by collisions with space objects billions of years ago
earths atmosphere protect us from collisions with small objects, which burn up in the air.
about 65 million years ago, a large space object struck Earth
tiny particles hit Earth's atmosphere all the time. Some of these particles have enough mass to make it trough the atmosphere
meteorites are objects that reach Earth's surface
scientist are using telescopes to find large, rocky space objects called asteroids
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