Galaxy clusters are formed by a dense packing of many galaxies, making them the most massive structures in the universe.

An inexplicably hot, fast-growing cluster of galaxies in the early universe has scientists questioning theories of galactic ...

The galaxy cluster appears hotter and more mature than it should for its young age, challenging what we think we know about ...

Gas within the cluster, which existed merely 1.4 billion years after the Big Bang, is at least five times hotter than ...

Just 1.4 billion years after the Big Bang, astronomers have identified a galaxy cluster “atmosphere” that appears far too hot ...

The “Seven Sisters” of the Pleiades are part of a much larger complex that can help reveal our galaxy’s deep history ...

Scientists have detected a surprisingly hot galaxy cluster dating back to the universe’s infancy. The cluster formed far earlier and burned far hotter than current models predict. Researchers believe ...

Astronomers found a young galaxy cluster with unexpectedly hot gas, suggesting cosmic structures formed faster than once ...

You'll find this terrific open cluster midway between 5th-magnitude Sigma Cassiopeiae and 6th-magnitude Rho Cas. This group ...

An international team of astronomers led by Canadian researchers has found something the universe wasn't supposed to have: a ...

Raise a toast to another orbit around the sun with a new NASA image of sparkling galaxy clusters fittingly dubbed the ...

A Canadian-led team of researchers has discovered a 'baby' galaxy cluster in the early universe surrounded by gas far hotter ...