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It's time to decide when to declare a planet lifeless

Life

It's time to decide when to declare a planet lifeless

Spacecraft are sterilised before they visit Mars to protect any life there – but it is expensive and no life has yet been found. When do we stop?

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Pluto probe hiccup caused by overloaded computer

Space

Pluto probe hiccup caused by overloaded computer

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New Horizons hiccup won't affect Pluto mission science

Space

New Horizons hiccup won't affect Pluto mission science

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Chasing Pluto's shadow in a Boeing 747

Space

Chasing Pluto's shadow in a Boeing 747

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Best-ever images of Pluto reveal baffling pepperoni slices

Space

Best-ever images of Pluto reveal baffling pepperoni slices

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Space

Lunar loser

Regulars

Space

New Horizons snaps first infrared image of Pluto

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Don't fear apocalyptic asteroids: you're safer than you think

Space

Don't fear apocalyptic asteroids: you're safer than you think

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Grand Theft Sedna: how the sun might have stolen a mini-planet

Space

Grand Theft Sedna: how the sun might have stolen a mini-planet

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Lava lakes spotted on Venus may be how it stays so blemish-free

Life

Lava lakes spotted on Venus may be how it stays so blemish-free

Our evil twin planet has a smooth face, implying its blemishes were masked by lava. Now we've finally seen evidence of the stuff bubbling up from a geological rift

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Life

Humans can bug-out to Mars without ruining search for life

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Earth

Dual asteroid strike hints at chaos in the inner solar system

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Space

NASA plans first interplanetary CubeSat mission for Mars lander

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Space

Philae awakes: What next for probe after 7 month nap on comet?

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