A gigantic sunspot group, rotating into view on October 17th, has grown to nearly the size of Jupiter and could trigger potent solar storms in the days ahead.
Find out where you can watch the partial solar eclipse taking place on October 23, 2014.
Just about everyone has heard of Halley's Comet, and each year in mid-October we get to witness a "shooting stars" spawned by this celebrated object.
Viewers in western North American are positioned perfectly to view the partial solar eclipse on the afternoon of October 23, 2104.
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,...
October is pleasant for nighttime observing because evenings are cool and come early. Use our downloadable stargazing podcast to find the month's highlights.
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.
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 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.
Get acquainted with SS Cygni, the sky's brightest cataclysmic variable star. It's guaranteed to keep you on your toes.
International Observe the Moon Night is an event that encourages people to "look up" and enjoy our nearest neighbor. This year's InOMN is Saturday, September 6th. Here's a quiz: What astronomical object looks amazing no matter what the magnification, never looks exactly the same no matter how often you view it, and can be...
Watch as the moon Rhea steals a star from the sky for nearly a minute on September 12th.
The astronomical calendar says autumn arrives on September 22nd. It's a season of transition, with plenty of celestial comings and goings in the evening sky. September’s equinox takes place on the 22nd at 10:29 p.m. Eastern Daylight Time. At that moment the Sun shines directly overhead as seen from the equator. Days and nights...
With a subtle beauty all its own, the earthshine we see glowing in the lunar night invites us to consider Earth's many connections to the Moon.
Seize the moment and bookend your next clear night with two fine telescopic comets: Jacques at dusk and Oukaimeden at dawn.
Celebrate the anniversary of a revolutionary discovery by gathering with other astronomers to observe planetary nebulae in August's evening sky.
Here's your invitation to view a spectacular close conjunction of the sky's two brightest planets, Venus and Jupiter, before dawn on Monday morning.
The media are all aflutter over the second of this summer's supermoon trio. But just how super is this moon, really?
This month's usually dependable Perseid meteor shower competes with a nearly full Moon. If you can find a dark viewing location, you might see a bright meteor every few minutes.
Late summer offers the Teapot of Sagittarius and the nearby arc of the Scorpion's Tail in the evening, the Perseid meteor shower, and a spectacular pairing of Venus and Jupiter before dawn.
The next time you're out watching a sunset, turn around and relish the mighty shadow of Earth looming just behind your back.
It's not a showstopper, but right now Comet Jacques (C/2014 E2) is poised for telescopic viewing in the hours before dawn.