images

Open cluster NGC 6791 in Lyra

by

Nasa/Esa/Novapix

Reference

a-aou67-91002

Date

2008-07-11

NGC 6791 is one of the oldest and largest open clusters known, about 10 times larger than most open clusters and containing roughly 10,000 stars. The cluster is located 13 000 light years in the constellation Lyra. The full Hubble Advanced Camera for Surveys field is full of stars estimated to be 8 billion years old. Two background galaxies can be seen at upper left.