To celebrate 100 years since Einstein formulated his theory of general relativity, we celebrate the beautiful observations created by a spacetime phenomenon known as gravitational lensing.
Astronomers have detected something baffling at the furthest frontiers of our observable universe: lots of massive galaxies that shouldn't even exist.
In a galaxy, 600 million light-years away, a black hole deathmatch is ripping up spacetime, exposing some fascinating dynamics at the heart of a powerful quasar.
From round disks to oval clusters; many galaxies in the Universe have undergone a dramatic transformation over the past eight billion years or so.
A study of more than 200,000 galaxies shows that the universe is producing half as much energy as it did 2 billion years ago and continues to fade.
Lithium has been detected in stellar material blasting away from an exploding star, possibly revealing the source of the basic element in young stars, thereby solving a mystery that has perplexed astronomers for decades.
The most dense galaxies known to exist in our universe have been discovered by 2 undergraduate students while looking through years of archival data.
Astronomers convened to present the latest findings on just about everything under the sun, and well beyond our solar system.
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