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An artist's impression of Planet Ten

Space

Weird orbits hint 'Planet Ten' might lurk at solar system edge

Astronomers studying icy objects in a distant region called the Kuiper belt say an unconfirmed planet with similar mass to Mars could be responsible for tugging them out of alignment

News

two maps of heat maps of twin plants side by side

Space

Mistaken brown dwarf is actually two planets orbiting each other

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Jupiter

Space

How Jupiter split the asteroid belt in two shows its great age

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Saturn’s moons could reassemble after a cosmic smash-up

Space

Saturn’s moons could reassemble after a cosmic smash-up

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Diagram of the shape of a synestia – like a red blood cell or a doughnut

Space

Huge impact could have smashed early Earth into a doughnut shape

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Zircon mineral grains

Earth

Early Earth was covered in a global ocean and had no mountains

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Protoplanetary disc around young star TW Hydrae.

Space

Earth may have been born in a huge flare-up of the young sun

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Mars and asteroids

Space

Mars Trojans may be part of a planet that was destroyed long ago

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meteorite artwork

Earth

Rocks of ages: How meteorites reveal the solar system's history

Features

Space

Distant DeeDee could be a new dwarf planet

New observations of an object beyond Neptune show it could be big enough to be considered a world in the same class as Pluto and Ceres

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Space

Mars is so small because Jupiter shook up its formation

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Space

NASA orbiter shows Mars lost 90 per cent of its CO₂ to space

News

Space

Pluto is still an ex-planet, no matter what its fans think

Comment

Space

Magnetic meteorites narrow down solar system’s birthdate

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