The primordial planet believed to have smashed into baby Earth, creating a cloud of debris that eventually formed into the moon, was chemically a near-match to Earth.
With the Quadrantid meteor shower, timing is everything.
The Earth will never catch up to the moon (let's hope), but the number of Ordovician craters may soon take off.
If you step outside before dawn during the next week or so, you might be able to see bright meteors streaking through the sky.
Amazingly, in a sprawling city of 1.2 million people, the impact near the international airport did not cause any known injuries.
A spacecraft chasing a comet in deep space has found that its target is surprisingly dark in color.
Scientists have found a strange structure resembling a microbial cell inside a Martian meteorite, but they're not claiming that it's evidence of Red Planet life.
Asteroids and comets that repeatedly smashed into the early Earth covered the planet's surface with molten rock during its earliest days, but still may have left oases of water that could have supported the evolution of life, scientists say.
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