Hubble: NGC 6791

http://hubblesite.org/newscenter/archive/releases/2008/25/
Using NASA's Hubble Space Telescope to study the dimmest stars in the cluster, astronomers uncovered three different age groups. Two of the populations are burned-out stars called white dwarfs. One group of these low-wattage stellar remnants (red circles) appears to be 6 billion years old, another (blue circles) appears to be 4 billion years old. The ages are out of sync with those of the cluster's normal stars, which are 8 billion years old.

Category:

Science & Technology

Tags:

• Hubble
• NGC
• 6791
• cluster