Physics
Cosmic uncertainty: Is the speed of light really constant?
The universe's ultimate speed limit seems set in stone. But there's good reason to believe it might once have been faster 鈥� and may still be changing now
Features
Physics
Universes that spawn ‘cosmic brains’ should go on the scrapheap
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Space
Rare mid-weight black hole found at heart of bright star cluster
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Physics
Have we found evidence that we live in a holographic universe?
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Earth
Earth鈥檚 water must have arrived here earlier than we thought
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Space
First evidence of dwarf galaxy merger boosts two cosmic theories
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Space
Binary stars shred up and shove off their newborn planets
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Space
Milky Way’s core could be spewing out planet-sized star chunks
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Physics
Cosmic radio bursts tracked to home galaxy for first time
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Physics
First test of rival to Einstein’s gravity kills off dark matter
A radical new model of gravity seems to account for bending of light by distant galaxies without invoking extra unseen mass whose identity remains mysterious
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Physics
Galaxy’s rapid growth spurt may have spawned 3000 suns per year
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Space
Dark matter that talks to itself could explain galaxy mystery
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Physics
Quantum particles seen distorting light from a neutron star
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Physics
Gravity may have chased light in the early universe
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