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comets

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Space

Deflected asteroids may keep coming back

Earth's gravity may pull a diverted asteroid back on a collision course the next time its orbit brings it close, researchers warn

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Astronomers defend asteroid warning mix-up

Space

Astronomers defend asteroid warning mix-up

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NASA blasted for ignoring smaller asteroids

Space

NASA blasted for ignoring smaller asteroids

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Dazzling comet outburst continues to mystify

Space

Dazzling comet outburst continues to mystify

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Comet brightens mysteriously by a factor of a million

Space

Comet brightens mysteriously by a factor of a million

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Are mirrors the best way to deflect asteroids?

Space

Are mirrors the best way to deflect asteroids?

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Powerful solar outburst rips off comet's tail

Space

Powerful solar outburst rips off comet's tail

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Mysteries remain over Peru meteorite impact

Space

Mysteries remain over Peru meteorite impact

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Dawn spacecraft launches to study giant asteroids

Space

Dawn spacecraft launches to study giant asteroids

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Odd object blurs line between comets and asteroids

Space

Odd object blurs line between comets and asteroids

An object seen repeatedly plunging close to the Sun is likely a comet masquerading as an asteroid, scientists say

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Earth

Earth's water brewed at home, not in space

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Life

Moon's gentle surface could hide life's secrets

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Life

Discovered: The asteroid that killed off the dinosaurs

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Space

Cosmic 'baby bouncer' could tie astronauts to asteroids

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