Several factors make Earth unique given what scientists know about the thousands of planets discovered to date.
Based on the findings of an independent review panel, NASA has taken stock of its fleet of orbiting astrophysics telescopes and decided which to save and which to shutter.
Slinking along through the sands of space is a "cosmic caterpillar" as dubbed by NASA in a new photo released from the Hubble Space Telescope.
The Milky Way's giant black hole turns out to be a messy eater. Of all the gas that falls toward it, 99 percent gets spewed back out into space, new observations show.
Astronomers have found a twin star to Earth's own sun, only much older. The rare star is the oldest known "solar twin," and offers a peek at what Earth's star will look like in 4 billion years.
Astronomers working with the Very Large Telescope in Chile plan to announce a "major result" Wednesday (Aug. 28).
NASA's infrared eye on the universe, the Spitzer Space Telescope marks its 10th year in space this Sunday (Aug. 25), and it's still going strong.
The eight newly selected astronauts joining NASA's spaceflying corps revealed some of the details of their grueling application process Tuesday (Aug. 20).
The deadline approaches for applications to join a one-way mission to Mars. Though the prospect is off-putting to many, it's also the dream of a lifetime to some.
Becoming an astronaut is one of the most difficult careers to achieve, but one requirement for the new recruits may surprise you — poetry.
When it comes to human missions to an asteroid and Mars, NASA can't go it alone, the space agency's administrator said today (Aug. 20).
If you can't make it to Sweden to see the Northern Lights, the next best thing is a new video of the aurora lights compiled from thousands of hours of observations by videographer Chad Blakley.
This month's full moon, which rises on Tuesday (Aug. 20), is not just a Blue Moon — it's also the Full Sturgeon Moon, the Full Red Moon, the Green Corn Moon and the Grain Moon.
Scientists will be meeting Thursday (Aug. 1) and Friday (Aug. 2) to form a game plan for observing what could be the "comet of the century," comet ISON, due to pass close to the sun this November.
A mysterious spiral of doom — okay, just a spiral-shaped galaxy — has been captured in a new image by the Hubble Space Telescope.
A new portrait of the Milky Way's neighbor, Andromeda, shows our twin galaxy in a whole new light thanks to a new instrument on Japan's Subaru telescope at the summit of Hawaii's Mauna Kea.
The U.S. space agency is in need of more women among its ranks, NASA's second-in-command said last week during a panel on women in space.
A strangely dense spot in the universe populated by a surprising amount of matter has been puzzling scientists since it was revealed in March in an all-sky map made by the European Planck satellite.