A new study of the seven Earth-sized exoplanets around TRAPPIST-1 indicate that all 7 planets are extremely similar to each other in makeup, but potentially quite different from Earth.

Redshifts reveal how an object is moving in space, showing otherwise-invisible planets and the movements of galaxies, and the beginnings of our universe.

On Trump’s way out of the White House, his administration demolished a law that protects migratory birds, putting over 1,000 species at risk. The Biden administration can still salvage it, but only if they act swiftly.

How to spot the radiant point for the Delta Aquariid meteor shower, going on now. Plus ... why meteors in annual showers have radiant points.

Go outside, and look for the waxing gibbous moon tonight. Then notice the stars nearby. Tonight's moon is within the Winter Circle stars.

A lunar sample collected during Apollo 17, the final mission to the moon, is now on display in President Biden's Oval Office.

Mars and Uranus passed close to each other in a conjunction on January 21, 2021. Photos from the event captured by EarthSky readers available here.

China's Chang'e 5 moon mission successfully returned moon rocks to Earth in December 2020 for the first time in 45 years. It's now headed toward an Earth-sun Lagrange point, with the goal of making sun observations.

A commercial nanosat called SpaceTy Beihangkongshi-1 - launched November 2020 - has successfully used an iodine thruster to change its orbit around Earth. This new thruster might help clear space junk by steering small satellites, at the end of their missions, back into Earth's atmosphere where they'd burn up.

The bright waxing gibbous moon shines in front of the constellation Taurus the Bull on January 22, 23 and 24, 2021. Here's how to look for the famous Pleiades star cluster and Taurus' brightest star, Aldebaran. The moon will pass between them on these nights.