Fooled by shadow play into thinking lunar mountains were pointy pinnacles? Learn why we often see them that way.
The dark ways of Algol the Demon Star, and what it can teach us about stellar evolution.
There's more than one way to see the constellations. Here's a look through Native American eyes. Orion the Hunter is arguably one of the most recognizable constellations in the sky. Striding the celestial equator, he charges up from this eastern horizon around 9 o'clock in late November, club in one hand and shield in the...
Often ignored in off years, why not treat yourself to the Leonids this month, a shower famed for fireballs and smoke trails.
While we may never see a planet orbiting a star other than the sun that doesn't mean we can't go there in a flight of fancy.
Most of us are familiar with the Seven Sisters, but have you met their brothers? Learn how to find more Pleiades than first meet the eye.
October's a perfect time to see the zodiacal light, a tapering tower of comet dust standing high in the eastern sky before dawn. Here's how to find it.
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").
Lonely Fomalhaut turns out to have plenty of company. Learn how to find its two remarkably distant stellar companions.
Learn exactly how and when to expect the next display of the northern lights with a few easy-to-use online tools.
Ten thousand stars bedazzle the eye on a dark night. Wait, how many?
Get acquainted with SS Cygni, the sky's brightest cataclysmic variable star. It's guaranteed to keep you on your toes.
Watch as the moon Rhea steals a star from the sky for nearly a minute on September 12th.
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.
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.
You'll be entering uncharted territory when you seek out this little known 'Shadow of the Veil' in Cygnus this summer.
The next time you're out watching a sunset, turn around and relish the mighty shadow of Earth looming just behind your back.
Fascinating faculae provide a way for anyone with a small telescope to track the ups and downs of the solar cycle — even when there are no sunspots.
Channel your inner superpower by looking up at the night sky precisely when a dazzling blaze of light is beamed to Earth from outer space.
Not every set of closely paired stars requires binoculars or a telescope to "split". Here's a guide to summertime doubles you can tackle with your eyes alone.
On July 5th, the Moon has a remarkably close brush with Mars, followed two nights later by a similar rendezvous with Saturn.
Astronomers now know the secret of this moon's strange two-faced appearance, but it's still remarkable to watch the "now you see it, now you don't" performance as it moves around Saturn.
Noctilucent clouds form at the boundary between Earth and space. Their electric blue billows incite the imagination and inspire us to keep watch at dusk for their arrival.
Since C/2012 K1's discovery two years ago, this first-time visitor from the outer solar system has brightened steadily and is now within reach of a small telescope and even binoculars.