Mysterious high-speed "bullets"—clumps of possibly oxygen-rich gas traveling at up to 20 million miles per hour—have been discovered shooting out of the rarest stellar explosion in our galaxy.

Scientists at the University of California, Riverside, have developed a new way to help gravitational-wave observatories see farther into the universe by solving one of their biggest challenges: tiny heat-induced distortions in the massive mirrors at the heart of the detectors.

A black hole may be stirring a "pot" of gas containing a neighboring galaxy in the early universe, according to a new study published in Astronomy & Astrophysics that used observations from NASA's Chandra X-ray Observatory. The galaxy slowly being "cooked" is named MQN01 J004131.9-493704, but astronomers have nicknamed it the "red potato" because of its appearance in images from NASA's James Webb Space Telescope.

For decades, astronomers have cast galaxy mergers as the universe's ultimate relationship drama: two galaxies collide, chaos erupts, black holes awaken and star formation comes to a screeching halt. Upending this long-held belief, new research from Florida International University suggests most galaxies don't "die" in spectacular cosmic pileups after all.

The star that formed the Jellyfish nebula may have had a partner star that exploded 100,000 years earlier, according to international researchers, who say that this may be the first known discovery of a binary star system in which both stars have gone supernova.