The "Hubble tension," one of the most frustrating and lingering problems in science, could be solved if Earth and the Milky ...

Celestial objects known as dark dwarfs may be hiding at the center of our galaxy and could offer key clues to uncover the ...

A team led by the Italian National Institute for Astrophysics discovered the most distant known fossil galaxy — a relic of ...

Two international teams zoned in on a potential answer to a decades-long mystery surrounding ephemeral cosmic X-rays.

The object was likely either a meteor or space junk, with most sightings of the streak of light and fireball coming from ...

Editor's Note: "Strange sightings in Lewis County" is an ongoing series by Chronicle reporter Owen Sexton focused on the unexplained. With World UFO Day having just passed on July 2, a recent report ...

The system consists of only a single millimeter-scale photonic chip without any moving parts.

This unprecedented view of the Bullet Cluster provided by the James Webb Space Telescope and the Chandra X-ray Observatory ...

Foreshadowing the great reflecting telescopes of the last century and a half, Lord Rosse managed in 1845 to erect a mighty ...

Dashboard and doorbell cameras across several Southeast U.S. states caught glimpses of the fireball that appeared to be ...

Scientists think they found evidence of weird ancient stars called "dark stars" that are powered by dark matter instead of ...