A cosmic explosion unlike any seen before has prompted astronomers to rethink long-standing ideas about the universe’s most ...

Scientists say interstellar object 3I/ATLAS shows unprecedented chemical and dynamical anomalies, challenging comet formation theories and potentially reshaping space science.

A flash of high-energy light from deep space has forced astronomers to rethink what they thought they knew about the most violent explosions in the universe. The event, a strange gamma-ray burst that ...

When a distant galaxy briefly outshines everything around it in high-energy light, astronomers usually know which playbook to reach for. Gamma-ray bursts tend to fall into familiar categories, either ...

Discovered on July 1 by the NASA-funded ATLAS telescope in Chile, 3I/ATLAS is only the third confirmed visitor from another ...

New 3I/ATLAS images from NASA and the ESA suggest the interstellar comet is active as it approaches Earth in December.

Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their ...

Galaxy clusters are the most massive objects in the universe held together by gravity, containing up to several thousand ...

According to NASA, Hubble took its latest photo of 3I/ATLAS on November 30 using its Wide Field Camera 3 instrument. At that ...

This infrared view offers the clearest look yet at how dwarf galaxies merge, evolve, trade gas and ignite waves of new stars.