National Aeronautics and Space Administration (NASA)

Risks to astronauts on extended missions include vision impairment, weakened bones and radiation exposure. There are also psychological risks from facing danger while being stuck inside a small craft.

In the 1980s, NASA engineer Robert Farquhar came up with a sly plan to divert the ISEE-3 satellite from its original path to visit a comet instead. Now Farquhar has another big plan for his "baby."

Long gone, but never forgotten, Voyager 1 is about 12 billion miles from home and now sailing through interstellar space, scientists were thrilled to confirm in 2013. The spacecraft carries with it a generation's dreams.

The iconic photo taken on Christmas Eve 1968 "came about by accident," says space writer and historian Andrew Chaikin. A new NASA animation shows just how close the astronauts came to missing the shot.

A University of Colorado Boulder led mission to Mars blasts off Monday morning. It’s the first time CU Boulder has led such a mission.The mission is being…

Are wildfires getting more severe or are more Coloradans moving into fire prone areas? Seen from space, development in the wildland urban interface near…

With the space agency largely grounded, employees Karen Nyberg and Mike Hopkins continue to orbit 250 miles above Earth aboard the International Space Station. While it's not clear they have all that much to do, their Twitter feeds show they may be getting creative — and perhaps a bit bored.

In addition to shutdowns of national parks (including Alcatraz and Yosemite) and the supplemental nutrition program for women, infants and children, the mandatory furloughs are affecting a wide range of government science and health agencies.

Scientists publishing in Astrophysical Journal Letters say they've used space telescopes to record faint light from the distant planet to get a rough map of its atmosphere.

All of that water has to go somewhere, and in the case of Colorado's historic flooding, those waters headed east - right toward the South Platte and…