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immune system

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Life

Pairs of habitable worlds could throw microbes at each other

Some exoplanet systems have planets a fifth as close together as Earth is to Mars, a factor that could drive interplanetary fraternisation

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Chinese satellite to shine a light on mysterious dark matter

Space

Chinese satellite to shine a light on mysterious dark matter

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Spacecraft that will put Einstein to the test ready for lift-off

Space

Spacecraft that will put Einstein to the test ready for lift-off

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Flying gold knocked the moon off course and ruined eclipses

Space

Flying gold knocked the moon off course and ruined eclipses

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Pluto deserves better than a one-night stand

Space

Pluto deserves better than a one-night stand

Comment

Beyond Pluto: New Horizons probe aims for another unseen world

Space

Beyond Pluto: New Horizons probe aims for another unseen world

Features

Pluto kept alive by antifreeze – other icy worlds could be too

Space

Pluto kept alive by antifreeze – other icy worlds could be too

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Our moon would be a planet under new definition of planethood

Space

Our moon would be a planet under new definition of planethood

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Origin of Earth's water traced back to the birth of our planet

Earth

Origin of Earth's water traced back to the birth of our planet

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Most distant solar system object yet could hint at hidden planet

Space

Most distant solar system object yet could hint at hidden planet

A newly discovered rocky body is more than three times more distant than Pluto. It and its companions could help solve a mystery about the outer solar system

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Space

Pluto surprises with ice volcanoes and alien weather

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Life

NASA debates where to land on Mars – but are we ready to go?

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Space

Salt flats on Europa mean moon's ocean may come to surface

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Space

Rosetta's comet has oxygen made before the solar system's birth

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