Two new studies suggest that ultraluminous X-ray sources are not all created by beefy black holes.
Officials proceeded with groundbreaking ceremonies for the world's largest optical telescope on October 7th amid protests from native Hawaiians who oppose it.
Astronomers might have an explanation for why some classical novae erupt in gamma rays.
Viewers in western North American are positioned perfectly to view the partial solar eclipse on the afternoon of October 23, 2104.
Peter Tyson, formerly Editor in Chief of NOVA Online, has been appointed Editor in Chief of Sky & Telescope, with responsibility for the brand’s print, digital, and video products.
Watch the International Space Station as it passes into the shadow of the Earth, and learn what other features to keep an eye out for (such as the "water dump").
Reports describing this morning's lunar eclipse are beginning to trickle in to our offices in Cambridge, Massachusetts.
You'll need to be up after midnight to watch the Moon plunge deep into Earth's shadow tomorrow morning — but it'll be worth it. Sometimes astronomical events occur in prime time — soon after it gets dark yet before bedtime. But that won't be the case tomorrow morning when, for the second time this year,...
Observations from several radio telescopes reveal that, when two galaxies merge, their progeny often have gaseous disks—a hypothesis that before now didn’t have solid observational evidence.
October is pleasant for nighttime observing because evenings are cool and come early. Use our downloadable stargazing podcast to find the month's highlights.
Lonely Fomalhaut turns out to have plenty of company. Learn how to find its two remarkably distant stellar companions.
New data collected by Galaxy Zoo show early galaxies with central bars, providing implications about how galaxies grow.
Start your day with an eclipse of the full Moon! On the morning of October 8, 2014, a total lunar eclipse will be visible across most of North America.
Learn exactly how and when to expect the next display of the northern lights with a few easy-to-use online tools.
A new analysis of Planck data bolsters the claim that the polarization signal heralded as evidence for cosmic inflation is from dust instead.
It's a historic day for India's maturing space program, as its first-ever interplanetary explorer successfully slipped into orbit around the Red Planet.
Astronomically speaking, the fall season comes to the Northern Hemisphere on Tuesday, September 23, 2014 at 02:29 UTC (Monday, September 22 at 10:29 p.m. EDT). At that moment, the Sun passes over the Earth’s equator heading south; this event is called the autumnal equinox.
On September 21st, after a 33-minute-long rocket firing, NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft slipped into orbit around the Red Planet.
Astronomers have detected a supermassive black hole in the center of a tiny galaxy — where it has no right to be.
NASA’s Night Sky Network is conducting a new survey in order to better help the amateur astronomy community.
European space officials have decided to drop their Philae lander on November 11th onto the small end of the already-active Comet 67P/Churyumov–Gerasimenko. Success is hardly assured.
Now two years into its exploration of Mars, NASA's big rover has reached the base of the huge mound that scientists hope will reveal the Red Planet's history.
On Wednesday, a powerful X-class flare ripped through the Sun's lower atmosphere and sent a blast wave directly toward Earth that should arrive Friday and produce moderate-to-strong auroras over the weekend.
A new diagram might link the diverse visible-light characteristics of quasars to two physical properties — essentially, their accretion rate and orientation. If the analysis holds up, it could point the way toward a long-sought unification.
Get acquainted with SS Cygni, the sky's brightest cataclysmic variable star. It's guaranteed to keep you on your toes.