11 November 2015, 03:30 PM ET
The Halloween 'dead comet' spooked the world with its abrupt appearance, why didn't we know about it earlier?
11 November 2015, 03:26 PM ET
A new test for defining the planetary status of an exoplanet has been formulated, but a certain dwarf planet in our solar system still doesn't make the planetary grade.
11 November 2015, 01:13 PM ET
A newly discovered planet is being called the closest Earth-size planet ever discovered, possibly providing the mouth-watering opportunity for a close-up look at the atmosphere of a rocky body around another star.
11 November 2015, 01:09 PM ET
Astronomers have found what may be the oldest stars in the Milky Way, in the galaxy's bulge — a discovery that reveals extraordinarily powerful explosions known as hypernovas might have dominated the Milky Way during its youth, researchers say.
11 November 2015, 01:00 PM ET
A planet close to its parent star is hot like Venus, but rotates quickly and could have a substantial atmosphere.
11 November 2015, 11:23 AM ET
The closest rocky planet (GJ1132b) like our Earth has been discovered, 40 light years out – revolving close in to an M-dwarf star about 1/5th the size of our Sun. It was uncovered by the MEarth-South telescope array on Cerro Tololo in Chile.
11 November 2015, 07:56 AM ET
The western lobe of Pluto's "heart" is surprisingly young — no more than 10 million years old — and the dwarf planet's atmosphere is surprisingly compact. The latest research from the New Horizons mission continues to reveal surprises from the dwarf plane
11 November 2015, 07:00 AM ET
An asteroid found itself trapped by the tidal forces of the white dwarf ‘undead’ star SDSS J1228+1040, then ripped apart. Observations by the European Southern Observatory's Very Large Telescope (VLT) reveal the remains of the space rock.
11 November 2015, 06:00 AM ET
A "zombie" star and the remains of its lunch are revealed in a new close-up view, 12 years in the making.
10 November 2015, 02:37 PM ET
Chronicling the second chapter of the European Space Agency’s mission to 67P/Churyumov-Gerasimenko, this fairy tale-like treatment of the two probes’ primary findings will warm your heart.
10 November 2015, 07:30 AM ET
New observations of Pluto's moons reveal a system in pandemonium, according to scientists with the New Horizons mission.
09 November 2015, 06:41 PM ET
Frozen and bonded to the surface? Or blasted into space? NASA MAVEN Principal Investigator Bruce Jakosky tells Space.com’s Calla Cofield that the sun seems to have been the culprit.
09 November 2015, 05:17 PM ET
Two enormous mountains on Pluto's surface bear a striking resemblance to volcanoes on Earth and Mars, which has piqued the interest of scientists with the New Horizons mission.
09 November 2015, 01:16 PM ET
Hydra, Nix, Kerberos and Styx behave like 'spinning tops" according to SETI Institute’s Mark Showalter. Hydra – the fastest rotation – spins at dizzying 89 times per Pluto orbit.
09 November 2015, 09:26 AM ET
ESA’s Rosetta probe scientists explain how Comet 67P/Churyumov–Gerasimenko’s sulfur, methane, alcohols and other organics lend support to long standing theories, which hold that that comets helped bring life to Earth.
09 November 2015, 07:00 AM ET
The groundbreaking ceremony for the Giant Magellan Telescope is scheduled to take place Wednesday (Nov. 11) at the Las Campanas Observatory in the Chilean Andes. The huge instrument should begin observing the heavens in the early 2020s.
08 November 2015, 01:11 PM ET
The sun stripped away most of Mars' atmosphere billions of years ago, "Star Trek" is coming back to TV and the search for signs of intelligent life around a strangely dimming star has come up empty so far. Here are Space.com's top stories of the week.
08 November 2015, 12:47 PM ET
From super-close views of the Saturn moon Enceladus' south pole to spectacular, newly released images of the October 2014 Antares rocket explosion, don't miss these amazing space images.
08 November 2015, 07:03 AM ET
Just in time for the flu season, the Earth is going to catch a bit of the sun's sneeze, following a solar eruption yesterday (Nov. 4).
06 November 2015, 04:06 PM ET
The universe is expanding, relativity speaking.
06 November 2015, 03:42 PM ET
Observations of a strangely dimming star thought to possibly host an alien megastructure have not turned up signs of communications from an alien civilization, although the chatter may simply be too faint to hear.
06 November 2015, 11:00 AM ET
A previously unidentified highway of dust extends across the Milky Way, between the sun and the central bulge.
06 November 2015, 08:00 AM ET
Most of the carbon dioxide from Mars' formerly thick atmosphere was lost to space billions of years ago, meaning the greenhouse gas cannot be accessed to help warm the planet up again.
06 November 2015, 07:30 AM ET
NASA astronauts Scott Kelly and Kjell Lindgren took a 6.5-hour spacewalk outside the International Space Station Nov. 6, beginning at 6:22 a.m. EST (1122 GMT). You can watch it live here, courtesy of NASA.
05 November 2015, 05:48 PM ET
The first astronauts to set foot on Mars may be in for a spectacular sight — the entire night sky filled with glowing auroras.
05 November 2015, 03:16 PM ET
NASA's New Horizons spacecraft completed the last of four trajectory-altering engine burns Wednesday (Nov. 4) and is now on course to a small body called 2014 MU69, which lies more than 1 billion miles (1.6 billion kilometers) beyond Pluto.
05 November 2015, 02:01 PM ET
New results from NASA's MAVEN spacecraft suggest that Mars lost most of its atmosphere — which had kept the Red Planet relatively warm and allowed it to support liquid surface water — to space about 3.7 billion years ago.
05 November 2015, 02:01 PM ET
NASA's MAVEN mission has measured the speed and direction of ions escaping from Mars as a result solar winds crashing into the planet.
05 November 2015, 12:15 PM ET
On Oct. 6th, 1995, the reported discovery of jupiter-like exoplanet 51 Pegasi b catalyzed serious scientific quests for another Earth-like world.
05 November 2015, 10:34 AM ET
Co-author of more than 800 scientific papers, Don Lincoln pursues a range of elusive questions, from the nature of dark matter to the structure of quarks and leptons.
05 November 2015, 10:12 AM ET
05 November 2015, 07:45 AM ET
Earth's chemical composition is drastically different from that of the rocks that helped to form the planet. Now, scientists think they may know why: The constant pummeling that formed Earth may have altered its composition.