401–420 of 443 results

Stellar Science

A Super-Duper Supernova

A much anticipated new type of exploding star lights up a distant galaxy.

Stellar Science

A Rogue Star Going Wild?

Is Eta Carinae, the famously erratic star in the southern sky, tipping off astronomers that its demise might come sooner than later?

Stellar Science

Stellar Mystery Solved, Einstein Safe

Astronomers have resolved a long-standing discrepancy with general relativity.

Exoplanets

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.

Stellar Science

Betelgeuse: A Hotheaded Superstar

New, ultrahigh-resolution observations reveal that the red supergiant marking Orion's shoulder is throbbing, churning, and spewing shells of its outer layers into the space around it.

Stellar Science

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.

Solar System

Solar Sleuths Tackle the "Quiet Sun"

New insights, announced this week, help explain why solar activity has been in the doldrums for an unexpectedly long time.

Astronomy and Society

New York Teen Finds Wimpiest Supernova

On November 7, 2008, 14-year-old Caroline Moore of Warwick, New York, discovered a supernova in the galaxy UGC 12682, making her the youngest person ever to find an exploding star.

Stellar Science

How Did the Brown Dwarf Get Its Spots?

A binary pair of brown dwarfs, measured with high precision, seems to defy models of star formation — unless one of them is covered with starspots.

Stellar Science

Bantamweight Planet and Three Dwarfs

Observing teams have turned up the lowest-mass planet yet detected around a Sunlike star — and a clutch of objects too small to be stars but not really planets either.

Exoplanets

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?

Milky Way

The Lost Siblings of the Sun

The Sun and solar system formed 4.6 billion years ago amid a rich cluster of other newborn stars. Where are they now?

Stellar Science

Surprising Trove of Gamma-Ray Pulsars

Pulsars flash in radio, but some of them flash a lot more powerfully in gamma rays, due to different processes happening in different places around them.

Cassiopeia A supernova remnant

Stellar Science

Fly Through a Supernova Remnant in 3-D

Astronomers have figured out the three-dimensional structure of Cassiopeia A, an expanding supernova remnant. From this, it looks like the star blew up in two parts.

Exoplanets

Fast-Forming Planets

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

Stellar Science

The Mystery of the Missing Brown Dwarfs

Fewer of these dim, glowing coals exist than astronomers once expected. And in particular, they shy away from associating with normal stars.

Stellar Science

Tycho's Supernova in Reruns

436-year-old light echoes give a look today at a blast in the Renaissance past. The catch? They're only a twenty-billionth as bright as the original.

Stellar Science

Betelgeuse is Making Waves

The famously red supergiant star that marks Orion's shoulder is creating an enormous shock wave as it plows through the interstellar medium. New infrared views from a Japanese space observatory called Akari show what's going on with unprecedented clarity.

Spacecraft and Space Missions

NASA Satellite Spots New Type of Pulsar

The Fermi Gamma-ray Space Telescope has made its first major discovery.

Stellar Science

The Sun Goes Round and (Less) Round

Incredibly precise measurements of the solar surface show that our star isn't quite as spherical as once thought.

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