28 September 2013, 08:17 AM ET
Here is a trivia question: Not including Earth, how many planets are visible without using any optical aid, be it binoculars or a telescope? Most people will usually answer five: Mercury, Venus, Mars, Jupiter and Saturn. But there's a sixth, Uranus.
27 September 2013, 05:09 PM ET
Adhara is a bright binary star in Canis Major that shows up best in ultraviolet light.
27 September 2013, 03:45 PM ET
If your pre-dawn sky is clear early Saturday (Sept. 28), you'll be treated to a lovely celestial scene as a fat, waning crescent moon will appear to pass close by the largest planet in our solar system: Jupiter.
27 September 2013, 02:09 PM ET
Astrophotographer Mike Taylor sent SPACE.com this stunning image showing the bright band of the Milky Way galaxy over Maine's rugged Bold Coast. The photo captures the Milky Way's brilliance colleague Garrett Evans sets up his gear.
27 September 2013, 06:01 AM ET
The possible "comet of the century," Comet ISON could either become a shining visual treat or a fizzled out chunk of rock and ice when it makes its close pass of the sun, but which will it be?
27 September 2013, 01:39 AM ET
Hadar is a binary-star system in the Southern Hemisphere. Its stars may go supernova in the future.
26 September 2013, 05:03 PM ET
As the constellations of summer depart from our sky, they are replaced by what are often called "the watery constellations." These include normal sea creatures like fishes and dolphins, and even Aquarius carrying a water jug. But here also be monsters.
26 September 2013, 03:30 PM ET
Among the more than 900 planets found beyond our solar system, there are volcanic super-Earths, gas giants that dwarf Jupiter and worlds with multiple sunsets. Here are some of the most incredible.
26 September 2013, 02:57 PM ET
A colossal NASA balloon is poised to carry a free-hanging gondola sky-high on a mission to take a gander at celestial grandeur: Comet ISON.
26 September 2013, 10:23 AM ET
“Highly Commended” by the Royal Observatory Greenwich’s Astronomy Photographer of the Year 2013 exhibition, this amazing space wallpaper is a composite shot showing the progress of an annular eclipse in May 2013.
26 September 2013, 01:04 AM ET
Fomalhaut has a planet that rose from the dead, as well as a vast number of comets that crash into each other daily.
25 September 2013, 10:00 AM ET
Astrophotographer Bob Franke captured this stunning image of planetary nebula Abell 39 6,800 light-years away from Earth. See how Franke made the image, and how planetary nebulas were named, despite not having any planets.
25 September 2013, 12:00 AM ET
A sounding rocket flies into an aurora.
24 September 2013, 05:03 PM ET
Procyon is a binary system, with a main-sequence larger star and a smaller white dwarf star orbiting each other.
24 September 2013, 01:26 PM ET
A fleet of spacecraft is gearing up to track the potentially dazzling Comet ISON as it flies by Mars next week. The comet will fly by Mars at a range of 6.5 million miles between Sept. 29 and Oct. 2.
23 September 2013, 08:24 PM ET
Deneb, one of the three stars of the Summer Triangle, anchors the tail of Cygnus the Swan.
23 September 2013, 05:40 PM ET
With a new season comes a new sky. The passing of the autumn equinox means that the days are beginning to shorten and weather is becoming colder for people in the Northern Hemisphere, but that isn't all that's changing.
22 September 2013, 09:41 AM ET
The autumn equinox today (Sept. 22) marks the first day of fall in the Northern Hemisphere. The exact time of the equinox is 4:44 p.m. EDT (2044 GMT) when the length of the day and night are roughly equal.
21 September 2013, 09:25 PM ET
What was your favorite space news story of the last week?
21 September 2013, 10:21 AM ET
From Venus and the moon crashing a wedding photo to the milky way over an ancient temple, don't miss these stunning night sky and space from the last week.
21 September 2013, 07:00 AM ET
SPACE.com readers around the world sent in their best photos of the Harvest Moon full moon of September 2013. See the amazing photos here.
20 September 2013, 09:29 PM ET
Regulus is a bright star in the northern sky that has at least two known stellar companions.
20 September 2013, 04:29 PM ET
Veteran astrophotographers Terry Hancock of Fremont, Michigan and former NASA scientist Fred Herrmann of Huntsville, Ala., teamed up to capture this stunning image of turbulent region of star birth, the Lagoon Nebula. See how they did it.
20 September 2013, 06:00 AM ET
Photographer Dustin Prickett captured this cosmic wedding photo with the moon and Venus overhead on Sept. 8, much to the delight of the unsuspecting bride and groom. See how he did it here.
20 September 2013, 05:30 AM ET
We have nothing to fear from Comet ISON, no matter how it behaves during its close solar approach this November. ISON will miss Earth by millions of miles — and so will its bits and pieces, if the comet happens to break apart along the way.
19 September 2013, 06:16 PM ET
Rigel is the brightest star in Orion, and will eventually explode into a supernova, most astronomers say.
19 September 2013, 04:39 PM ET
Skywatchers across parts of the United States and southern Canada have several chances to spot the new private Cygnus spacecraft as it chases the International Space Station across the pre-dawn sky. Weather permitting, it will be possible to see both spac
18 September 2013, 07:39 PM ET
Canopus is the second-brightest star in the night sky despite its distance from Earth.
18 September 2013, 06:00 PM ET
Tonight's full moon is called the Harvest Moon because many fruits and vegetables tend to ripen in the late summer and early fall. Farmers once relied on this full moon's light, working late into the evening to harvest their crops.
18 September 2013, 04:11 PM ET
The seasons will change this Sunday, with the Northern Hemisphere moving into autumn and the South emerging from winter into spring. The celestial event that marks this transition is called an "equinox." What is an equinox, and why does it occur?
17 September 2013, 10:36 PM ET
Arcturus is a red giant that is one of the brightest stars in Earth's night sky.
17 September 2013, 03:52 PM ET
A new commercial spacecraft built to haul cargo to the International Space Station will launch into space from Virginia's Eastern Shore Wednesday, and it just might be visible from a wide swath of the U.S. East Coast. Here's how to see it.