Supernova Refsdal blew up once but burst into view at least five times. The timing of its appearances provides clues to how fast the universe is growing.
A burst of light and a cloud of dust are signs that a star 12,000 light-years away swallowed a planet up to 10 times the mass of Jupiter.
The James Webb telescope spied planet-building material around young stars in a nearby galaxy whose chemical makeup matches that of the early cosmos.
An excess of positrons in Earth’s vicinity supports the idea that the Fermi bubbles were burped by the Milky Way’s supermassive black hole long ago.
Detecting similar emission from a distant world could help astronomers find other planets that boast bright and beautiful rings.
A machine learning technique filled in data gaps in the image of M87’s black hole, resulting in a thinner ring.
The exhibition examines how light pollution harms astronomy, ecosystems and human cultures. But it also offers hope.
The finding suggests that early galaxies might have gained more of their bulk from streams of cold gas instead of in violent galaxy collisions.
Astronomers spotted both a fast radio burst and gravitational waves from a cosmic smashup in the same part of the sky and at about the same time.
TRAPPIST-1b is hotter than astronomers expected, suggesting there’s no atmosphere to transport heat around the planet.