The Earth is getting a second moon for a limited time beginning the end of September. An asteroid will come close enough to Earth to temporarily enter its orbit at the end of the month, a phenomenon ...

Over 4.6 billion years ago, Earth took shape from a spinning cloud of dust and gas surrounding the young sun. Tiny particles within this cloud collided and clumped together, driven by gravity and ...

Scientists think a small rock discovered near Earth last August was hurled into space by an ancient impact on the lunar surface. By Becky Ferreira For a few months last fall, a school-bus-size space ...

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