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Where do comets come from?

Space

Where do comets come from?

These cosmic apparitions have had humans pondering their nature for millennia, yet theories of where comets originate still don't stand up

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Alien asteroid dust hints at Earth-like planets

Space

Alien asteroid dust hints at Earth-like planets

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Earth

Comet smashes triggered ancient famine

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Meteor impacts may have sparked life on Earth

Earth

Meteor impacts may have sparked life on Earth

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Has an alien comet infiltrated the solar system?

Space

Has an alien comet infiltrated the solar system?

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Meteorite hunters hit pay dirt in Canadian prairie

Earth

Meteorite hunters hit pay dirt in Canadian prairie

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Big bang's afterglow may reveal birthplace of comets

Space

Big bang's afterglow may reveal birthplace of comets

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Did lack of comet impacts help life evolve?

Earth

Did lack of comet impacts help life evolve?

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Science could soar with world's most powerful rocket

Space

Science could soar with world's most powerful rocket

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Mars craters might be scars from fallen moon

Space

Mars craters might be scars from fallen moon

An unusual pair of craters formed when a moon broke apart and crashed into the Martian surface, new calculations suggest

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Space

Jupiter produced greatest pounding in Earth's history

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Space

Space rock collides with Earth right on time

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Space

Space rock found on collision course with Earth

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Space

UN urged to coordinate killer asteroid defences

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