Deep Sky
M67
Constellation  Cancer

 Discovered by Johann G. Koehler in 1779, this cluster is one of the older open clusters around, anywhere between 3.2 and 5.1 billion years, there is reason to believe, that this maybe the birthplace of our sun. While not the oldest known open cluster, few are known to be older, nor are there any of them are closer to us.  M67 is important to astronomers for studying the evolution of stars since it is well populated.  Note that there are about 30 blue stragglers in the cluster.  Blue stragglers are given the name as young stars, but they are not in a young cluster.  Astronomers think it is because they may be the result of two older stars colliding and with the new additional material, now burning as a young star.