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Stars can start shining at a smaller mass than we thought

Space

Stars can start shining at a smaller mass than we thought

Objects with only 6.7 per cent of the sun’s mass can be stars, according to a fresh measurement of how massive an object must be to achieve nuclear fusion

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Picture of Earth looking very round and blue

Earth

Odds on: Five scientific theories decided by wager

Features

an exoneptune with its star

Space

Neptune-like exoplanet spotted that has a watery atmosphere

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Space

NASA rocket mission takes 1500 sun images in just 5 minutes

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Waves surge in opposite directions around Io's largest lava lake

Space

Waves surge in opposite directions around Io's largest lava lake

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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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screen grab of TV report on Fukushima disaster

Health

Fukushima accident gave everyone an X-ray’s worth of radiation

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Saturn

Space

Watch Cassini's first two dives between Saturn and its rings

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Marvel at the images from Cassini's first Grand Finale orbit

Space

Marvel at the images from Cassini's first Grand Finale orbit

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First look at images from Cassini's dive between Saturn's rings

Space

First look at images from Cassini's dive between Saturn's rings

These are the first images of the planet taken as the Cassini spacecraft made the first of its 22 planned dives between its rings.

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Space

Melting moons could support liveable atmospheres for aeons

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Space

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

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Space

Joint mission to Europa could seek life under the ice

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Space

Icy Enceladus’s tiger stripes are a window on its watery depths

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