27 July 2015, 05:50 PM ET
Scientists and engineers had to work at breakneck speed to get New Horizons launched during a brief window in January 2006, or the probe's highly anticipated Pluto encounter would have been pushed into 2016 at the earliest.
27 July 2015, 05:49 PM ET
With all the news about Pluto this month, most skywatchers may not be aware that Ceres, the brightest and nearest of the dwarf planets, reached its opposition to the sun on Saturday (July 25).
27 July 2015, 04:01 PM ET
The definition of "Blue Moon" has evolved slowly to the modern "2nd full moon in a month" formulation. But what sky-watchers usually see is the same old grayish-white – unless a volcanic eruption filters the Sun’s reflected light. Science@NASA explai
27 July 2015, 03:30 PM ET
The dream of returning humans to the moon could become a reality for the relatively low price of $10 billion, as long as NASA is willing to buy from private spaceflight companies, a new report shows.
27 July 2015, 03:20 PM ET
The UK Space Agency has released its National Strategy for Space Environments and Human Spaceflight. This strategy covers a range of scientific and technical disciplines, giving a picture for activities that use the space environment.
27 July 2015, 03:16 PM ET
Like Scotty pulling a bit of extra power out of the Enterprise, the "Star Trek: Axanar" fan film easily warped past its initial $250,000 goal this weekend. Now, its creators plan to ask an old "Star Trek" ally for help.
27 July 2015, 02:00 PM ET
New Horizons principal investigator Alan Stern and other space scientists will discuss solar system exploration with members of the U.S. House of Representatives' science committee during a hearing at 10 a.m. ET Tuesday (July 28). Watch it live here.
27 July 2015, 02:00 PM ET
A United Launch Alliance Delta IV Medium rocket will launch the seventh Wideband Global SATCOM (WGS-7) mission for the U.S. Air Force on July 23, 2015, from Cape Canaveral Air Force Station, Florida.
27 July 2015, 12:02 PM ET
The Perseid meteor shower will peak on Aug. 12th and 13th with raining debris from Comet Swift-Tuttle. Venus and Mars make an appearance in the morning sky, and Saturn is an evening planet. Also, Cygnus (the Swan) and Lyra (the small harp)...
27 July 2015, 11:45 AM ET
NASA astronaut Scott Kelly is one of two people trying to last a year in space. These are some of his best pictures so far.
27 July 2015, 10:11 AM ET
Weak solar activity could slowly fire up the ocean circulation mechanism, increasing the amount of warm water and air flowing to Greenland.
27 July 2015, 09:47 AM ET
On the Hubble Servicing Mission 4, astronaut Mike Massimino encountered a screw that refused to budge. The now infamous screw, which was attached to a handle of the space telescope that needed to be removed, caused some anxiety in 2009.
27 July 2015, 08:52 AM ET
Atmospheric pressure at the surface of the icy dwarf is surprisingly low. Previous Earth-based estimates were more than double New Horizons’ reading.
27 July 2015, 07:31 AM ET
An Arctic crater holds promise for figuring out how to spot something interesting on the moon or Mars, an astronaut says.
27 July 2015, 07:00 AM ET
NASA's planet-hunting Kepler space telescope continues to zero in on the first "alien Earth" despite being hobbled by a glitch more than two years ago. The mission's huge dataset should keep researchers busy for decades, team members say.
27 July 2015, 06:00 AM ET
The famous bright spots at the bottom of Ceres' Occator crater appear to be sublimating material into space, creating a localized atmosphere within the walls of the 57-mile-wide (92 kilometers) hole in the ground, new observations by NASA's Dawn spacecraf
26 July 2015, 06:00 AM ET
Planet like an older Earth is found, Stephen Hawking signs on to an ambitious search for extraterrestrial life and a faulty strut is proposed as the cause of SpaceX's rocket explosion in Space.com's top news stories of the week.
26 July 2015, 06:00 AM ET
From amazing new views of Pluto's glaciers and mountains to artist's depictions of newfound "Earth cousin" Kepler-452b and photos of sunspots captured from Mars by NASA's Curiosity rover, don't miss these stunning space images.
24 July 2015, 05:14 PM ET
The U.S. Air Force successfully launched the latest addition to a multisatellite military communications array. The launch also marked the first use of a new main engine meant to standardize Delta IV launch vehicle configurations.
24 July 2015, 04:08 PM ET
Amazing new photos of Pluto from NASA's New Horizons spacecraft show a dwarf planet covered in rugged terrain, exotic flowing ices and a hazy atmosphere. NASA unveiled the new discoveries on July 24, 2015.
24 July 2015, 04:03 PM ET
NASA New Horizons' principal investigator Alan Stern and co-investigator Michael Summers break down the new discoveries at a press conference on July 24th, 2015.
24 July 2015, 04:00 PM ET
The Slooh Community Observatory will host a webcast Saturday (July 25) at 8 p.m. EDT (0000 GMT Sunday) to discuss the discovery of Kepler-452b, which NASA officials say is the most Earth-like exoplanet yet found.
24 July 2015, 03:58 PM ET
NASA New Horizons' deputy project scientist Cathy Olkin and co-investigator William McKinnon reveal Pluto composition data at a press conference on July 24th, 2015.
24 July 2015, 02:34 PM ET
The northwestern Sputnik Planum and Hillary Montes is highlighted in this simulated fly-by. Created from images obtained from NASA's New Horizons probe's close fly-by.
24 July 2015, 01:44 PM ET
Asteroid 2011 UW158 is irregularly shaped and has an unusually fast spin. The asteroid is 2000X1000 feet across (600X300 meters) and made its closest approach to earth at 1.5 million miles on July 19th, 2015.
24 July 2015, 12:10 PM ET
NASA's New Horizons probe is about to lift the veil on Pluto. See Space.com's complete coverage of the spacecraft's epic July 14 flyby of the dwarf planet.
24 July 2015, 11:42 AM ET
Four images of the icy dwarf were snapped 280,000 miles (450,000 kilometers) away, which "shows features as small as 1.4 miles (2.2 kilometers)," according to New Horizons' team.
24 July 2015, 11:26 AM ET
NASA unveiled a false-color look at Pluto Thursday (July 23) to highlight the weird differences in terrain on the dwarf planet. The enhanced color allows scientists to detect differences in the composition and texture of Pluto's surface.
24 July 2015, 11:17 AM ET
A vast cluster of dead galaxies roughly 300 million light-years from Earth may hold as much as 100 times more dark matter than visible matter, researchers say.
24 July 2015, 11:00 AM ET
A super-dense, spinning star punched a hole right through its stellar neighbor, carving off a giant cloud of dust and ejecting it away at nearly 15 percent the speed of light, images from NASA's Chandra X-ray Observatory reveal.
24 July 2015, 10:17 AM ET
A G2-type star (Kepler 452), the same class as the Sun, harbors the planet Kepler-452b. The planet is 60 percent larger than Earth and receives 10 percent more energy from its Sun than the Earth.
24 July 2015, 06:00 AM ET
Japan's asteroid-scooping spacecraft Hayabusa 2 is on its way to an asteroid known as 1999 JU3. Now, the country's agency is inviting the public to come up with a clever name for the mission's target.
24 July 2015, 06:00 AM ET
A group of pioneers magically transported to the surface of Kepler-452b would instantly realize they weren't on their home planet anymore; they'd feel this truth in their bones and muscles, thanks to the increased surface gravity.
23 July 2015, 06:03 PM ET
Get ready, Plutophiles: More exciting science from the New Horizons mission to Pluto will be announced in a media event today (July 24).
23 July 2015, 02:43 PM ET
Astronomers have announced the discovery of planet Kepler-452b, orbiting a star very much like the sun but older and hotter.
23 July 2015, 12:28 PM ET
Kepler-452b size is important because it receives 10 percent more energy from its Sun than we do from ours. That mass protects it from experiencing "runaway greenhouse effect and the loss of its water inventory," according to NASA.