It is one of the oldest known open star clusters with an estimated age of 4 billion years.
M67 shines at magnitude 6.9 and subtends an apparent size of 25 arcminutes. At a distance of 2,700 light-years, its true size in space would be 23.5 light-years in diameter.
The cluster contains more than 500 stars and 11 bright spectral-type-K giant stars as well an many red giants. It also contains more than 150 white dwarfs - stars at the end of their lifetimes. M67 also contains 30 anomalous blue stragglers.
M67 was discovered by Johann Gottfried Koehler sometime before 1779. Charles Messier independently rediscovered M67 in 1780.
North is to the top in the above image.