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light

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 – and may still be changing now

Features

Boltzmann brains

Physics

Universes that spawn 'cosmic brains' should go on the scrapheap

News

Globular cluster 47 Tucanae

Space

Rare mid-weight black hole found at heart of bright star cluster

News

Hologram

Space

Have we found evidence that we live in a holographic universe?

Comment

A meteorite from the Sahara

Earth

Earth’s water must have arrived here earlier than we thought

News

galaxies

Space

First evidence of dwarf galaxy merger boosts two cosmic theories

News

Artists rendition of a binary star with a disc of dust around it

Space

Binary stars shred up and shove off their newborn planets

News

One spherical object being ejected by a larger one

Space

Milky Way's core could be spewing out planet-sized star chunks

News

Radio telescopes

Space

Cosmic radio bursts tracked to home galaxy for first time

News

Galaxy cluster with lensing effects

Space

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

News

Space

Galaxy's rapid growth spurt may have spawned 3000 suns per year

News

Space

Dark matter that talks to itself could explain galaxy mystery

News

Space

Quantum particles seen distorting light from a neutron star

News

Space

Gravity may have chased light in the early universe

News