To date vestiges of almost 180 impact craters have been found on Earth. These craters were formed by heavenly bodies colliding with our planet in the past. During its 4.6 billion year history Earth has been bombarded by a variety of astronomical objects, including comets and asteroids, all helping to shape the planet as it is today. There are still countless such bodies floating in space. A meteorite could hit the Earth with catastrophic consequences at any time, and the world's astronomers have now begun to cooperate in an effort to find these potentially threatening visitors from space. In this edition of Earthrium, we focus on an obvious but oft-forgotten fact: that the Earth is just one heavenly body among millions of others floating in the cosmos.

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→Our planet in space
→Craters around the world
→Protecting Earth from meteorites
→Links