Cosmology

A new satellite galaxy discovered orbiting the Milky Way is either an incredibly ancient, soon-to-fragment clump of stars or the most dark-matter-dominated dwarf galaxy ever found.

Two gargantuan structures discovered near our galaxy's ancient heart may be some of the earliest building blocks of the Milky Way. Researchers have named them Shiva and Shakti.

A study of 91 pairs of stars finds that about 8%, or one in 12, swallowed up a planet at some point in their lives.

Recent observations show that some white dwarf stars suddenly stop cooling. Now, scientists propose a 'fountain of youth' mechanism that may explain how these stellar husks avoid death for billions of years.

A stunning new map of the magnetic fields at the Milky Way's center charts never-before-seen features, and raises new questions about how our galaxy's central engine works.

The ancient obect Gz9p3, which appeared as a single point of light through the Hubble Space Telescope, is actually one of the most enormous galaxies in the early universe, James Webb Space Telescope observations reveal.

Two new James Webb Space Telescope images show off massive bubbles carved out of a stellar nursery by giant, baby stars growing in a nearby galaxy.

Astronomers have taken the most detailed image of the Vela supernova remnant ever. The stunning, 1.3-gigapixel image is also the largest ever released from the Dark Energy Camera.

A nova outburst visible to the naked eye is expected to decorate the night sky this year with a "new star" that will briefly become as bright as the North Star, offering a once-in-a-lifetime stargazing opportunity.

Complex organic molecules spotted by the James Webb Space Telescope may hint at how habitable planets form.