Where is the universe hiding its missing mass?

Chandra X-ray Center

Astronomers have spent decades looking for something that sounds like it would be hard to miss: about a third of the "normal" matter in the Universe. New results from NASA's Chandra X-ray Observatory may have helped them locate this elusive expanse of missing matter. From independent, well-established observations, scientists have confidently

Researchers find evidence for a new fundamental constant of the Sun

The Sun's corona - its outermost layer of atmosphere.

New research undertaken at Northumbria University, Newcastle shows that the sun's magnetic waves behave differently than currently believed. Their findings have been reported in Nature Astronomy. After examining data gathered over a 10-year period, the team from Northumbria's Department of Mathematics, Physics and Electrical Engineering found that magnetic waves in the sun's

Titan’s oddly thick atmosphere may come from cooked organic compounds

HAZY HAVEN Titan may get its hazy atmosphere (shown in natural color in this image from NASA’s Cassini spacecraft) from organic molecules warmed by the decay of radioactive elements in the moon’s core.

Titan may have a home-baked atmosphere. Saturn’s largest moon gets some of its thick atmosphere by cooking organic molecules in a warm core, a new study suggests. The decay of radioactive elements may warm Titan’s core from within, splitting nitrogen and carbon off from complex organic molecules. Once free, those elements can

Making stars when the universe was half its age

The Hubble Ultra Deep Field of galaxies. A new study of the star formation activity in 179 of the galaxies in this image including many dating from about six billion years ago confirms an earlier puzzling result: lower mass galaxies tend to make stars at a rate slightly slower than expected.

The universe is about 13.8 billion years old, and its stars are arguably its most momentous handiwork. Astronomers studying the intricacies of star formation across cosmic time are trying to understand whether stars and the processes that produce them were the same when the universe was younger, about half its