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Planets May 25, 2018

Pluto may have formed from 1 billion comets

At its heart, Pluto may be a gigantic comet.

Planets May 23, 2018

Here's why Saturn's inner moons are shaped like ravioli and potatoes

The odd shapes of Saturn's inner moons , which resemble objects ranging from ravioli to potatoes, may be due to mergers of tiny moonlets, a new study finds.

Planets May 23, 2018

Ringed, rocky alien planets may hide in plain sight

Astronomers may have unknowingly discovered rocky planets with rings, which they mistook for other kinds of worlds, a new study finds.

Planets May 22, 2018

Jupiter's backward-flying asteroid from another star system

CAPE CANAVERAL, Fla. (AP) — Just months after the discovery of our first known interstellar visitor, it turns out there's another asteroid from yet another star system residing in our cosmic club in plain view.

Planets May 21, 2018

Mysterious 'Planet Nine' gets more evidence from weird space rock

The solar system just got a bit stranger. As astronomers continue their ongoing quest to find the elusive Planet Nine, a team found a space rock that lends credence to the idea that a huge super-Earth planet really exists in the outer reaches of our solar system.

Spaceflight May 21, 2018

Does humanity really need a backup Earth?

SpaceX CEO Elon Musk has a vision: He wants to get humans to Mars as soon as possible. He already wowed the world this year, when the Falcon Heavy launched and flung a Tesla car toward the asteroid belt. And this heavy-lift rocket will be dwarfed by the boosters Musk plans for Mars exploration, which he says will carry colonists in fleets of ships to the Red Planet.

Planets May 17, 2018

Earth-like alien planets could experience 'snowball states'

Earth-like planets with severe tilts and orbits could enter abrupt "snowball states," in which entire oceans freeze and surface life cannot survive, according to new research.

Planets May 15, 2018

Seasonal changes in exoplanet's atmosphere could signal alien life

Seasonal changes in an alien planet's atmosphere could signal the presence of extraterrestrial life, new research suggests.

Planets May 14, 2018

This may be the best evidence yet of a water plume on Jupiter's moon Europa

The case for a giant plume of water vapor wafting from Jupiter's potentially life-supporting moon Europa just got a lot stronger.

Planets May 14, 2018

Saturn's gorgeous rings and 3 moons shine in stunning Cassini photo

NASA and the Cassini team have given us another gorgeous blast from Saturn's past.

Planets May 11, 2018

Shocker: Is Pluto going to become a planet again?

The long-simmering argument about Pluto's planethood has just flared up again.