Voyager makes an interstellar discovery

Space & Earth / Space Exploration

Dec 26, 2009 | 4.7 / 5 (60) | 24

The solar system is passing through an interstellar cloud that physics says should not exist. In the Dec. 24th issue of Nature, a team of scientists reveal how NASA's Voyager spacecraft have solved the mystery.

Vampires and collisions rejuvenate stars

Space & Earth / Astronomy

Dec 23, 2009 | 4.3 / 5 (9) | 2

Stars in globular clusters are generally extremely old, with ages of 12-13 billion years. However, a small fraction of them appear to be significantly younger than the average population and, because they ...