Mysterious Medium-Size Black Holes May Lurk at the Centers of Small Galaxies

The hearts of small galaxies may hide a mysterious kind of black hole that has long proved elusive: medium-size black holes with masses between the mass of a few suns and that of millions of suns, a new study finds.

'Running Man Nebula' Sprints Across the Stars (Photo)

The Running Man Nebula, also known as NGC 1977, vaguely resembles a colorful space ghost sprinting through the stars in the Orion constellation.

Aliens May Well Exist in a Parallel Universe, New Studies Find

According to a new pair of studies in the journal Monthly Notices of the Royal Astronomical Society, there’s a decent chance that life-fostering planets could exist in a parallel universe — even if that universe were being torn apart by dark energy

No Way Out? Aliens on 'Super-Earth' Planets May Be Trapped by Gravity

"Super-Earth" planets are giant-size versions of Earth, and some research has suggested that they're more likely to be habitable than Earth-size worlds. But a new study reveals how difficult it would be for any aliens on these exoplanets to explore space.

Airplane passenger captures beautiful geomagnetic storm

This geomagnetic storm was captured on camera from an airplane flying east over Canada on Tuesday. Geomagnetic storms produce “auroral currents” known as “northern lights.”