Evidence from observations sheds doubt on cosmic cannibalism as a source for galaxy growth, suggesting that instead galaxies grow by pulling in gas from the intergalactic medium.
Light from the puniest galaxies played a bigger role in shaping the early universe than previously thought.
A newly discovered radio burst places these ultrafast, ultrabright pulses on the cosmic map of unknown phenomena.
Saturn’s largest moon Titan played a cameo as an exoplanet, allowing astronomers to better understand how a thick layer of haze or clouds might affect their observations of more distant alien worlds.
Exoplanet missions are shifting their goals from counting to characterizing, with multiple instruments coming online to directly image these alien worlds.
Kapteyn’s star — a nearby star that likely formed outside this galaxy — hosts two planets more than twice as old as Earth.
Data from NASA's Kepler space telescope point to three distinct molds of exoplanets — rocky worlds, gas dwarfs, and ice/gas giants — distinguishable based on the abundances of heavy elements in their host star’s atmosphere.
Two elements deep within Cassiopeia A, hint the supernova remnant underwent a quark nova — a theoretical second explosion that leaves behind a quark star — just days after the original supernova.
A neighboring galaxy’s central black hole powers strong winds, allowing astronomers — for the first time — to spot those gales pushing out star-forming gas.
Astronomers have created the most realistic computer simulation of the universe’s evolution to date, tracking activity across 13 billion years of cosmic history.
A new processing technique has revealed once-invisible planetary disks encircling five stars imaged in Hubble’s archive.
Astronomers have used a new technique to measure — for the first time — the spin of an extrasolar planet.
In 2010, a mysteriously bright supernova appeared, later sparking a debate within the astronomy community. But new images of the now-faded supernova reveal an intervening — and until now invisible — cosmic lens, which magnified its light.
By combining nearly 1,500 observations with sophisticated computer models, astronomers have shed light on a nearby planetary system, proving that the planets' bizarre orbits will actually remain stable for the next 100 million years.
The odd behavior of a star in the heart of the Stingray Nebula provides tantalizing evidence that we may be seeing, first-hand, its helium-shell flash: an explosive phase of nuclear burning at the end of a star’s life.
The newly discovered planet, Kepler-186f, is the first Earth-size exoplanet circling in its star’s habitable zone. The media worldwide is gleaming with fantastical headlines, but readers in the know may have an inkling the result is less than it seems.
New images from NASA’s Cassini mission show bright spots along Saturn’s A ring, likely caused by a small moonlet in the process of forming or shattering.
Take a look at this supernova remnant from radio waves to x-rays to see multiple features of its bubble-like expanding shock wave. Supernovae — the dramatic explosions of massive stars ending their lives — can outshine their host galaxies for weeks, allowing them to be seen across millions of light-years of empty space. On...
Sizzling gas giants circling close to their host stars — so-called hot Jupiters — keep their host stars young and active, a new study suggests.
The Northeast Astronomy Forum in Suffern, NY, will welcome visitors from across the world on April 12–13, 2014. Sky & Telescope will be there. Will you?
The most precise measurement yet of the Hubble parameter illuminates dark energy — the elusive entity that’s accelerating the universe’s expansion.
Astronomers have developed a new method to measure distances to bright but faraway galaxies, a tool which will help better constrain the expansion rate of the universe.
Data from NASA’s Cassini spacecraft have provided further evidence that Saturn’s tiny moon Enceladus harbors a liquid ocean under its surface.
This year’s April Fools' provides a wealth of alarming results. Catch up on all the scientific shenanigans here.
Join the world’s largest celebration of astronomy — Global Astronomy Month — throughout April.