The universe is overrun with dark matter, outweighing the ordinary stuff that stars and planets are made of five-to-one. But ...

A stronomers report the discovery of a truly incredible object. They are calling it Candidate Dark Galaxy-2 (CDG-2), a ...

A tight clump of four star clusters sits in the Perseus galaxy cluster, and at first glance it looks like nothing special. No ...

The dense centers of globular clusters are home to a whole zoo of exotic astrophysical phenomena. Dr. Kremer studies the unexpected events experienced by compact objects — black holes, neutron stars, ...

Globular clusters are ancient, spherical groups of stars that are often as old as the galaxies they orbit. The stars in a globular cluster orbit the center of mass of the cluster, and the angular ...

A glittering multitude of stars in the globular cluster Terzan 4 fills this image from the NASA/ESA Hubble Space Telescope. Globular clusters are collections of stars bound together by their mutual ...

Globular clusters are often described as ancient, tightly bound fossils of the early Milky Way. It has been believed that these dense balls of stars have survived and remained unchanged for billions ...

The NASA/ESA Hubble Space Telescope has identified thousands of more than 5 billion years old globular clusters in the Virgo cluster of galaxies. One of the results of these discoveries led ...

The globular cluster Terzan 2 in the constellation Scorpio is featured in this observation from the NASA/ESA Hubble Space Telescope. Globular clusters are stable, tightly gravitationally bound ...

Globular clusters are the fossils of the astronomical world. We know they are very old, having formed shortly after the Big Bang. Furthermore, they must be pretty robust, since many have survived ...

It seems like the only things I have seen in the evening sky recently have been clouds. Although the garden plants are happy with the rain, my dogs are unhappy about the thunder. Whenever the sky does ...