New James Webb Space Telescope images reveal the grisly past of Cassiopeia A, the youngest known supernova remnant in the Milky Way.
A bizarre 'ultraluminous X-ray source' shines millions of times brighter than the sun, breaking a physical law called the Eddington limit, a new study finds.
Powerful bursts of radiation called fast radio bursts could be launched when neutron stars collide and merge, gravitational wave detections indicate.
Astronomers using the James Webb Space Telescope have detected the four oldest galaxies in the known universe, which are forming stars much faster than thought possible.
A bizarre object called "the Cow" is the flattest explosion ever detected, and the first example of a rare phenomenon called a fast blue optical transient (FBOT).
Scientists are taking a closer look at the afterglow left by the brightest gamma-ray burst ever recorded, and what they see doesn't fit with any theoretical models.
China is deploying thousands of sensors nearly a mile under the ocean's surface, to monitor the darkness for flashes of light that reveal the presence of a neutrino.
Astronomers have detected enormous shockwaves rattling the cosmic web that connects all galaxies in the universe, offering vital clues on how the largest structures in space were shaped.
The light from the distant Sparkler galaxy was spotted in the James Webb Telescope's First Deep Field and could teach us how our own Milky Way devoured other galaxies to grow.
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