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More like a planet than a comet, scientists say.
Spectrometer analysis of mountainous region by NASA's Mars Reconnaissance Orbiter.
'If we want to find life ... this is where we should start to look.'
New modelling looks at one of the Moon's most mysterious features.
Scientists edge closer to understanding mysterious ultra-luminous X-ray sources.
Five of the best images of the week.
Stellar old timers can tell us about the galaxy's youth.
The recipe is simpler than you think.
Why does methane ice settle on this region?
One of the spacecraft's final findings before it plunged to its death.
Stars can explode with the brilliance of five trillion Suns.
A slippery particle trapped and traced.
New experiments force rethink on chemistry of hidden ocean.
Grains are of unexpectedly uniform composition.
Apollo rocks show fallout rained down two million years ago.
Jets blasting from their centre point in the same direction.
Evicted from its solar system, perhaps?
A chilly 'small ice giant', with a rocky core and gassy sheath.