04 June 2015, 01:40 PM ET
Dwarf planet Ceres and asteroid Pallas, discovered in 1801 and 1802, are visible in the night sky in June. Ceres was originally classified as a planet, then an asteroid, and finally a dwarf planet after further observation.
04 June 2015, 07:00 AM ET
The path to Pluto this summer for NASA's New Horizons spacecraft should be relatively smooth and safe, a new and improved portrait of the dwarf planet's moons suggests.
04 June 2015, 07:00 AM ET
A campaign called "Dear Pluto" aims to get kids around the country excited ahead of the New Horizons spacecraft's historic flyby of the dwarf planet this summer.
03 June 2015, 01:01 PM ET
Pluto's moons are even stranger and more intriguing than scientists had imagined, observations by NASA's Hubble Space Telescope reveal.
31 May 2015, 07:00 AM ET
NASA announced the science instruments for its mission to Europa, SpaceX was certified for U.S. military launches and a tiny solar-sailing spacecraft suffered a glitch in orbit. Here's a look at Space.com's top stories of the week.
30 May 2015, 11:13 AM ET
From a nebula's crimson heart to a dragon's-eye view, don't miss these amazing space images of the week for May 31, 2015.
28 May 2015, 06:45 PM ET
New Horizons' hunt for new moons, rings and other potential hazards near Pluto has turned up nothing so far.
27 May 2015, 05:02 PM ET
NASA's New Horizons probe, which will make the first-ever flyby of Pluto on July 14, captured the images with its long-range camera from May 8 through May 12, when the spacecraft was a bit less than 50 million miles from the dwarf planet.
27 May 2015, 07:00 AM ET
The free Pluto Safari app, which came out last month, keeps tabs on NASA's New Horizons mission, counting down its July 14 close encounter to the second, and teaches users about the frigid, distant realm the spacecraft is exploring.
22 May 2015, 10:34 AM ET
A manned mission to Pluto may be far out, but it's not impossible.
19 May 2015, 07:00 AM ET
NASA is considering allowing a team of researchers, teachers, artists and engineers to upload an interstellar message to the agency's New Horizons spacecraft, which will perform the first-ever flyby of Pluto on July 14.
15 May 2015, 07:00 AM ET
NASA's New Horizons probe, which is set to perform the first-ever flyby of Pluto on July 14, has begun hunting for possible rings and undiscovered moons, in an effort to identify potential hazards near the dwarf planet.
14 May 2015, 11:00 PM ET
As New Horizons nears its closest approach with Pluto, the mission team is hosting 'Pluto-Palooza' events in multiple locations around the country.
12 May 2015, 08:08 PM ET
New Horizons took a series of images from April 25 through May 1. The shots mark the first time New Horizons has managed to resolve the extremely faint Pluto moons Kerberos and Styx, mission team members said.
03 May 2015, 10:31 AM ET
A Russian cargo vessel suffered a serious malfunction on its way to the space station, NASA's MESSENGER probe slammed into Mercury and the New Horizons spacecraft snapped the best-ever photos of Pluto. Here's a look at Space.com's top stories of the week.
29 April 2015, 05:02 PM ET
New photos of Pluto and its largest moon, Charon, by NASA's New Horizons spacecraft have revealed tantalizing hints at surface features on the dwarf planet, including signs of a polar ice cap. See the photos from new Horizons here.
29 April 2015, 04:17 PM ET
Dwarf planet Pluto and its largest moon Charon are seen to orbit one another in this set of images from NASA’s Pluto New Horizons LORRI camera, taken when the spacecraft was about 90 days out from its closest encounter.
19 April 2015, 09:20 AM ET
SpaceX nearly pulled off an unprecedented rocket landing during a cargo launch to the International Space Station and NASA's New Horizons probe returned its first color image of Pluto. Here's a look at Space.com's top stories of the week.
15 April 2015, 07:16 AM ET
NASA's New Horizons mission to Pluto has returned its first color image of the dwarf planet and its largest moon, Charon. The new photo was taken on April 9, from a distance of about 71 million miles (115 million kilometers).
14 April 2015, 09:55 AM ET
Ground-based and Hubble images of Pluto suggest it might be the reddest object in the Solar System. New Horizons' Principal Investigator Alan Stern explains how this could have happened.
09 April 2015, 04:41 PM ET
Traveling through space at 30,000 miles per hour poses some risks, which is why NASA's Pluto-bound New Horizons probe is wearing a bulletproof vest.
08 April 2015, 01:45 PM ET
Flying twice the speed of a Space Shuttle, a collision with cosmic debris could be catastrophic. Flying twice the speed of a Space Shuttle, a collision with cosmic debris could be catastrophic.
07 April 2015, 07:00 AM ET
The deadline for the "Our Pluto" naming campaign — a collaboration involving NASA, the International Astronomical Union (IAU) and the SETI (Search for Extraterrestrial Intelligence) Institute — has been extended to April 24.
06 April 2015, 02:22 PM ET
Thanks to instruments on board NASA's New Horizon's spacecraft, which will fly by Pluto this summer, scientists are able to get an unprecedented look at the space weather near the dwarf planet.
31 March 2015, 12:45 PM ET
Much is unknown about Pluto, including what its surface features are like and what kind of weather patterns it has, if any.
30 March 2015, 07:00 AM ET
Scientists are considering further targets for NASA's New Horizons spacecraft to visit following its Pluto encounter this summer, should funding be provided.
24 March 2015, 02:32 PM ET
NASA's New Horizons' principal investigator Dr. Alan Stern talks to Space.com about the importance of the mission to the "wild west" of our solar system, a place where no other probe has been.
24 March 2015, 07:38 AM ET
Researchers working on NASA's New Horizons mission, which will zoom through the Pluto system on July 14, are asking the public to propose and vote on names for geological features the probe will identify on Pluto and its largest moon, Charon.
15 March 2015, 11:29 AM ET
NASA launched a new space-weather mission and scientists found evidence of a hydrothermal system on Saturn's ocean-bearing moon Enceladus. Here's a look at Space.com's top stories of the week.
12 March 2015, 07:33 AM ET
New Horizons, which will zoom through the Pluto system on July 14, fired its engines for 93 seconds on Tuesday (March 10), when it was about 3 billion miles from Earth — the most distant engine burn ever, mission officials said.
10 March 2015, 03:42 PM ET
Even 100,000 million miles away, NASA’s New Horizons probe has begun delivering unprecedented views. The mission's principal investigator Dr. Alan Stern tells Space.com just how much better the imagery will be.
08 March 2015, 12:48 PM ET
A powerful camera spotted a comet and scientists captured images of a supernova four different times. Here are Space.com's pics for the top space stories of the week.
06 March 2015, 10:20 PM ET
These two events will make 2015 an exciting year for solar system exploration and discovery. But there is much more to this story than mere science.
27 February 2015, 07:00 AM ET
Inside New Horizons is a small piece of SpaceShipOne, the first privately owned and operated spacecraft to reach space twice within a period of 14 days. The feat, which SpaceShipOne accomplished in 2004, won the $10 million Ansari X Prize.
25 February 2015, 11:38 AM ET
2015 an exciting year for solar system exploration and discovery.
21 February 2015, 04:46 PM ET
Europe's last cargo spacecraft came down to Earth in a fiery blaze and scientists reported seeing mysterious plumes emanating from Mars. Here are Space.com's picks for the best space stories of the week.