A mosaic image shows magnetic activity on the solar disk, which is surrounded by the relatively faint corona.

A "Mangrove Forest" of Magnetism May Help Heat the Sun's Corona

New simulations might explain why the sun's atmosphere is bizarrely millions of degrees hotter than its surface

An artist's vision of a brilliant quasar at the core of a young galaxy.

Rare Quartet of Quasars Found in the Early Universe

The quirky set of extremely bright black holes challenges theories for how the cosmos reached its current structure

A shuttle astronaut's view of the International Space Station.

To Get Rid of Space Junk, Shoot It Down With Lasers

Proposals to send debris-targeting craft into orbit are piling up, and one mission may soon start test firing from the space station

When young planets collide.

The Moon Was Formed in a Smashup Between Earth and a Near Twin

But solving one puzzle of lunar origins has raised another linked to the abundances of tungsten in the primordial bodies

The colorful salt terraces in the Dallol region of Ethiopia are hot targets for astrobiologists seeking extreme microbial life that could resemble extraterrestrials.

This Alien Color Catalog May Help Us Spot Life on Other Planets

A digital library of reflectance spectra from microbes could be a powerful tool for spotting signs of extraterrestrials

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