281–300 of 311 results

Exoplanets

Super-Earth "Planet From Hell" Refined

CoRoT-7b, a hot super-Earth orbiting an orange dwarf in Monoceros, had proved to be rocky, not gaseous. It's truly a Dante-like inferno, with liquid-lava temperatures on one side and unearthly cold on the other.

Exoplanets

CoRoT-7b, the Lava Planet

A "super-Earth" planet discovered last February turns out to be just as dense and rocky as Earth. But with its day side seared to perhaps 2,700°F, there might not be much solid ground to stand on.

Stellar Science

Why Does Exoplanet WASP-18b Exist?

Observers have found a massive planet so close to its star that it orbits in less than a day. Either they were very, very lucky — or theorists really don't understand the inner workings of stars as well as they thought.

Exoplanets collide around HD 172555

Exoplanets

Exoplanets' "Demolition Derby"

Within the past 1,000 years or so, two planet-size objects collided around the young star HD 172555 and created a titanic, white-hot fireball whose glassy ashes are still swarming around the star.

Exoplanets

Kepler Shows Its Promise

After just 1½ weeks of test observations, scientists are confident that the Kepler spacecraft is well on its way to discovering Earthlike planets around distant stars.

Exoplanets

Mapping Starspots by Exoplanet Transits

Astronomers have detected individual starspots by watching exoplanets cross in front of them. New advances may enable extensive mapping of stars' spottedness by this technique, filling gaps left by other methods.

Exoplanets

Planetary Preemies?

Protoplanetary disks around three young stars turn out to have large central holes, which were presumably cleared by still-growing Jupiter-mass planets. But there’s a problem: the stars are too young.

Exoplanets

At Last, an Exoplanet by Astrometry

After decades of frustration and false alarms, astronomers may finally have a new method in their toolkit for finding planets around other stars: astrometry.

Spacecraft and Space Missions

Exoplanet Mapping Tested on Earth

Researchers are developing a method to detect oceans and clouds on planets orbiting other stars. To test this idea, they aimed the telescope aboard NASA’s Deep Impact probe toward Earth, and made a rough map of our world.

Stellar Science

Fomalhaut's Disk and Fomalhaut's Spin

Way out in the circumstellar cold, a planet and a rubble disk orbit bright Fomalhaut. Does this have anything to do with the star's own rotation?

Exoplanets

Super Sendoff for Planet-Hunting Kepler

After a dramatic and flawless liftoff, NASA's newest space observatory is getting ready to observe a tract of Milky May with a single-minded purpose: find as many alien worlds as it can.

Exoplanets

COROT Finds the Smallest Exoplanet Yet

Astronomers have found the smallest transiting exoplanet yet, with a silhouette only about 1.7 Earth diameters wide. It's also the fastest-orbiting planet known, with a "year" lasting 20 hours.

Exoplanets

HD 80606b: The Hotheaded Exoplanet

Astronomers have found a "hot Jupiter" whose atmospheric temperature jumps nearly 1,300°F in just six hours! That gives a whole new meaning to "global warming."

Astronomy and Society

These Stars Need You

Here's a star-buying scheme we can support.

Exoplanets

Exoplanets Dance in the Same Plane

Three planets orbit the red dwarf star Gliese 876, and at least two of them do so in nearly the same plane, according to an ingenious new study of their interaction.

Stellar Science

Fast-Forming Planets

Around newborn stars, Jupiters seem to grow quicker than expected.

Exoplanets

Have a Hot Time on WASP-12b

An international team of observers has found an alien world where the temperature is always a toasty 4,600°F and it takes just a second or two to get a great suntan.

Exoplanets

A Distant World in Hot Water

Astronomers report that a planet circling a star 63 light-years away in Vulpecula is wreathed in an atmosphere containing water vapor.

Exoplanets

Another Direct Exoplanet Image

A tiny, glowing dot apparently orbits just inside the inner edge of the dusty debris disk surrounding the star Beta Pictoris, 64 light-years away.

Exoplanets

First True Exoplanet Images…Probably

Although questions remain, it appears that astronomers have at last taken images of actual planets orbiting other stars.

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