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.