22 May 2015, 07:01 AM ET
A newfound galaxy 12.5 billion light-years from Earth is the most luminous one known in the universe, blazing more brightly than 300 trillion suns. The engine behind the galaxy's brilliance may be a supermassive black hole, researchers said.
22 May 2015, 07:00 AM ET
Cubesats have pushed beyond the sphere of academia, becoming major tools for governments conducting a variety of missions and for companies earning revenues from space.
22 May 2015, 07:00 AM ET
On May 4, NASA's Lunar Reconnaissance Orbiter performed two engine burns, changing its orbit to one that gets within 12 miles (20 kilometers) of the moon's south pole and 103 miles (165 km) of the north pole.
21 May 2015, 01:30 PM ET
The Medusa Nebula's most detailed close-up ever shows a dying star's fate, similar to what will befall our sun in a few million years. The colorful display of gas some 1,500 light-years from Earth is happening because a star in the center of the nebula is
21 May 2015, 07:15 AM ET
Type Ia supernovas have long been used to measure the expansion of the universe. New research suggests that at least some of these explosions occur in systems with a white dwarf and a full-fledged companion star.
20 May 2015, 05:45 PM ET
Alien planets likely experience "space weather," just like Earth's solar system. A team of scientists is trying to determine if such weather could make other planets inhospitable to life.
20 May 2015, 11:30 AM ET
The unmanned X-37B spacecraft is scheduled to blast off today (May 20) from Florida's Cape Canaveral Air Force Station during a four-hour window that opens at 10:45 a.m. EDT. You can watch it live beginning at 10:45 a.m. EDT.
20 May 2015, 06:30 AM ET
A giant alien planet is seemingly too big for its cool dwarf star, raising questions about how it could possibly have formed. Further investigation of this odd exoplanet could help scientists understand how planets form, researchers said.
20 May 2015, 06:20 AM ET
Hubble launched on April 24, 1990 and was deployed a day later. The telescope opened its eyes for the first time after a nearly monthlong checkout process, capturing an image of several stars with its Wide Field/Planetary Camera on May 20, 1990.
19 May 2015, 01:03 PM ET
The European Southern Observatory's Very Large Telescope captured the finest view to date of Sharpless 2-274, a ‘retired’ star about 1500 light-yearts from Earth in the Gemini constellation.
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.
18 May 2015, 01:34 PM ET
Three boulders balancing like ballerinas have been spotted on the surface of a comet by the Rosetta spacecraft. Only a small area on the surface of each rock is touching the ground, similar to "balancing rocks" seen on Earth.
17 May 2015, 10:33 AM ET
A Russian cargo craft may have failed due to a problem with the rocket that launched it into space, and an astronaut explains how to "go" in space. Here are Space.com's top stories of the week.
17 May 2015, 09:17 AM ET
From the coast of Japan to a dragon selfie, don't miss these amazing space images of the week for May 17, 2015.
17 May 2015, 07:01 AM ET
The unmanned X-37B spacecraft is scheduled to launch Wednesday (May 20) at 10:45 a.m. EDT atop a United Launch Alliance Atlas V rocket from Florida's Cape Canaveral Air Force Station, kicking off the vehicle's fourth mission.
15 May 2015, 11:38 PM ET
On May 14th, 2015, exactly two months before the fly-by of Pluto is expected, mission scientists gathered at the American Museum of Natural History in NYC to speak to a crowd of school kids and museum patrons about the historic event.
15 May 2015, 04:23 PM ET
If you've been a fan of NASA's website for more than a decade, you can thank an unlikely space geek: actor Tom Cruise.
15 May 2015, 04:15 PM ET
By tracking the phases of six exoplanets, astronomers have tracked their daily weather cycles for the first time.
15 May 2015, 12:45 PM ET
The neutron star SGR 1745-2900 near the Milky Way's supermassive black hole Sagittarius A* is not slowing down its X-ray output as expected. Data from Chandra's X-ray Observatory show a slow decline in X-ray brightness and high temperature surfaces.
15 May 2015, 10:50 AM ET
The Hubble Space Telescope was used to study 3000 white dwarf stars in Milky Way star cluster 47 Tucanae. The white dwarfs are migrating outward from the center of the cluster, which is home to hundreds of thousands of stars.
15 May 2015, 10:30 AM ET
The House Science Committee approved four bills on commercial space topics during a lengthy markup session May 13 marked by partisan divides on a number of issues.
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.
14 May 2015, 07:49 PM ET
NASA's Kepler mission captured over 2 months of Triton's orbit of Neptune. Small moon Nereid joins in on the dance on Day 24 and some streaking asteroids make the flurry complete.
14 May 2015, 04:24 PM ET
A giant nebula in the early universe hits the jackpot when it comes to rare, bright objects known as quasars, boasting four within surprisingly close proximity to one another. The first known quasar quartet lies in a cloud of cool gas that could provide a
14 May 2015, 01:54 PM ET
A dense cloud of gas that astronomers are calling a 'cosmic dinosaur egg' appears to be on the cusp of birthing millions of stars. This may be the youngest example of an object called a globular cluster.
14 May 2015, 12:47 PM ET
See amazing images of the night sky and cosmos in SPACE.com's gallery of cosmic images posted in April 2015.
14 May 2015, 07:18 AM ET
"Chaotic planets" that possess wildly unpredictable orbits and climates likely circle distant stars, suggesting that some alien worlds that look habitable might actually be hostile to life for millions of years at a time, a new study reports.
14 May 2015, 07:00 AM ET
As dark matter circles around a black hole, it might create a gamma-ray signal that could be detectable from Earth. A visible signal from the otherwise-invisible stuff would be a major breakthrough in the study of this mysterious material.
13 May 2015, 10:33 PM ET
A clue to one of the biggest questions in cosmology — why did regular matter survive to fill the universe, instead of antimatter — may have been found in data from NASA's Fermi Gamma-ray Space Telescope.
13 May 2015, 05:01 PM ET
A new NASA image, captured by MODIS on the Aqua satellite, reveals clouds cover two-thirds of Earth, with some zones supporting more clouds than others on the planet.
13 May 2015, 04:09 PM ET
Bill Nye (The Science Guy) wants you to be a part — and get a part — of a "revolutionary solar sailing spacecraft." The leader of The Planetary Society has started crowdfunding for LightSail, a citizen-funded flight by light.