At the center of our galaxy, hidden behind dense clouds of gas and dust, the black hole Sagittarius A* rotates rapidly, ...

How do globular clusters remain intact for so long? As stars orbit the common center of mass, shouldn't they cross orbits and ...

Globular clusters are spherical and extremely compact stellar agglomerates that are usually home to one to two million stars.

A stunning Blood Moon March 13/14 caps off plenty of planetary action and sparkling stars in the sky this week.

The constellation Hercules contains two of the finest globular star clusters visible in the Northern Hemisphere: M13 (below) and M92 (not shown -- yet!). Each contains several hundred thousand stars, ...

This latest Hubble image share highlights the globular cluster that's gone by many (and, as NASA notes, fairly boring) names since its existence was first recorded in 1826. The actual sight of NGC ...

Star clusters are formed when gravity pulls young stars together, forcing them to orbit each other. A star cluster can ...

A blast of radio waves from the outskirts of an ancient galaxy challenges theories about what creates such bursts.

Young stars coming to life out of the proverbial celestial dust is perhaps the most captivating sight in the cosmos. Check ...