Articles by

Mara Johnson-Groh

The earliest evidence of the first stars may lie in a distant gas clump

There’s a new contender for the universe’s earliest first-generation stars. A bright clump seen about 450 million...

A new measurement reveals gravity is still hard to pin down

Physicists have just dropped a new precise measurement for gravity. The newly published value for the strength...

Dark matter ‘nuggets’ could explain the Milky Way’s mysterious glow

A puzzling ultraviolet light seen across the Milky Way could come from the destruction of nuggets of...

Boiling oceans may sculpt the surfaces of small icy moons

Small, icy moons might be boiling under their surface. Many moons in the outer solar system are...

Early views of a supernova’s first moments reveal a lopsided blast

When one supernova commenced, it looked like an olive — at least before it got shaken and...

This black hole flipped its magnetic field

The magnetic field swirling around an enormous black hole, located about 55 million light-years from Earth, has...

Betelgeuse’s companion star revealed in new images

Hidden cozied up to Betelgeuse, a bright red star in the constellation Orion, astronomers may have finally...

A gas cloud 5,500 times as massive as the sun lurks nearby

Astronomers have found a giant interstellar cloud surprisingly close to Earth. Lurking about 300 light-years from our...