Jesse Emspak

A source of mysterious radio signals could be from a passing comet, but astronomers are skeptical.

A new video shows how the stars in the constellation Orion will move over the next 450,000 years, reshaping the well-known night sky figure.

The vacuum of empty space may be roiling with energy that drives the expansion of space itself, a new hypothesis proposes.

In the year 1 million, humans might still exist — but they won't be like humans today.

With the nights getting warmer, skywatchers will have a fine show tonight (May 10) from the May full moon, known as the Full Flower or Milk Moon.

The futuristic tech of "Alien: Covenant" may be closer than we think: A proposed lunar rover built by privately funded team from Germany will make an appearance in the film.

Giant eruptions of material and smaller jets from the sun's surface are closer cousins than anyone thought.

In this wonky, non-Euclidean universe, the floor can fall away from your feet as you walk forward and distances aren't what they seem.

An Einstein letter shows a generous spirit and a little criticism.

Researchers have cracked a secret of the Milky Way's neighboring Andromeda galaxy: A mysterious x-ray source is likely a pulsar, the rapidly-spinning corpse of a massive star.

Earth and the sun are very different, but their atmospheres share something in common: A type of wave that undulates through Earth's skies may have an analogue in the body of the sun.

Astronomers are seeing what Earth's own galaxy looked like in its youth by scanning the skies for some of the oldest objects in the universe.

On the dwarf planet Ceres, volcanoes rage — but instead of hot lava coming out of them as on Earth, they spew brine and ice.

The Eclipse Megamovie project is asking citizen scientists to capture images of the 2017 total solar eclipse. The snapshots will be stitched together into two movies.

Matter and antimatter should look the same. For the first time, physicists have experimental evidence that they don't.

Scientists have proposed a new way to build a quantum computer using microwaves to control individual atoms, and they say the new method offers a blueprint for a more useful computing machine.

The moon may carry traces of life from Earth dating back to when plants first filled the planet's air with oxygen, according to a study of data from a Japanese lunar orbiter.

Pluto's largest moon, Charon, had a process like Earth's plate tectonics beneath its surface, driven by a freezing ice core that expanded and cracked the little world's crust.