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immune system

Pluto showing heart-shaped

Space

Pluto may have tipped over when Charon tugged at its heart

The iconic heart-shaped feature on Pluto is so dense that it could have led to the entire dwarf planet swivelling over time

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Long-term view of extreme cosmic burst challenges astronomers

Space

Long-term view of extreme cosmic burst challenges astronomers

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A hypothetical view of Planet Nine

Space

More evidence for Planet Nine as odd celestial alignment emerges

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Titan

Space

Bubbling ocean on Saturn’s moon could explain vanishing island

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Full moon

Space

Moon’s lack of water down to ancient shift in its spin axis

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Ceres surprises with water ice and colourful bright spots

Space

Ceres surprises with water ice and colourful bright spots

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Elliot crater

Space

Pluto: A whole new world in 5 strange photos

Features

Pluto may have hosted lakes and rivers of liquid nitrogen

Space

Pluto may have hosted lakes and rivers of liquid nitrogen

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Pluto gives up its icy secrets as New Horizons data pours in

Earth

Pluto gives up its icy secrets as New Horizons data pours in

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Oort cloud

Space

The Oort cloud surrounds our solar system – why can't we see it?

It's a giant sphere of a trillion rocks encircling us that occasionally sends comets slinging our way. That's a convincing story – but we'd love some direct evidence

Features

Space

Mercury once had a graphite crust floating on a sea of magma

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Space

ExoMars probe set to sniff out signs of life on the Red Planet

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Space

Galactic collisions doom entire star systems to black-hole death

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Space

Exclusive photos: Clouds seen on Pluto for first time

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