One suggestion is the star collapsed into a black hole without producing a supernova—a phenomenon that has never been identified in such a large star before.
R5519 is thought to have formed through a collision with a "victim" galaxy about three billion years after the Big Bang.
Astronomers hope images of C/2019 Y4 (ATLAS), taken by the Hubble Space Telescope in April, could help us to understand what causes a comet to break apart.
FRB 180916 is only the second repeating fast radio burst to be traced back to its source galaxy.
AM 2026-424 is the latest creepy cosmic image to be released ahead of Halloween.
The galaxies formed in the first two billion years after the Big Bang.
It's confirmed: The universe is expanding 9 percent faster than expected.
The image of the galaxy includes up to 15 million stars.
A red giant pierces the billowing cloud of this vibrant nebula.
Researchers used cameras on board the Hubble Space Telescope to capture ultraviolet and visible pictures of the nearby galaxies.
The dust could be evidence of evolving infant exoplanets.
A magic trick turns the universe into a giant magnifying glass.
Scientists predict that the tiny moon will be destroyed within 30 to 50 million years.
The galaxy in question appears as it was 11 billion years ago, just 2.7 billion years after the Big Bang.