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
Features
Space
Alien asteroid dust hints at Earth-like planets
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Earth
Comet smashes triggered ancient famine
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Earth
Meteor impacts may have sparked life on Earth
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Space
Has an alien comet infiltrated the solar system?
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Earth
Meteorite hunters hit pay dirt in Canadian prairie
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Space
Big bang’s afterglow may reveal birthplace of comets
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Earth
Did lack of comet impacts help life evolve?
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Space
Science could soar with world’s most powerful rocket
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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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