The solar system’s smallest planet comes to a standstill in the evening sky before starting its retrograde motion for the next few weeks.

Today in the history of astronomy, an eclipse isn’t the only stunning thing in the sky.

Astronomers have detected the most massive black hole merger ever observed, challenging stellar evolution and black hole formation theories.

While astronomers have previously seen young discs that contain newborn, massive, Jupiter-like planets, McClure says, “we’ve always known that the first solid parts of planets, or planetesimals, must ...

At incredibly small scales, the universe operates according to the unfamiliar rules of quantum mechanics. And Planck’s ...

Spot the Broken Engagement Ring asterism near Merak in Ursa Major, easily viewed with binoculars or a low-power telescope.

Today in the history of astronomy, a star is captured in an astrophotography first.