Fall is here and that means the return of some of our old night-sky friends. One of note is the Pleiades, the Seven Sisters. Rising a little after 7 p.m., by 9 p.m. they are directly east and about 40 degrees above the horizon. They appear as a tiny dipper-shaped group of stars visible to the eyes.
They are an open cluster of 1,000 stars about 450 light-years away, and all formed from the same dust cloud about 100 million years ago. They are young hot stars that will drift apart over time. There are many open clusters in the Milky Way Galaxy. They reside in the plane of the galaxy where the dust can be found.
Come join us at the Insperity Observatory for Public Night on the first Friday each month from sunset to 10 p.m. and check out this celestial wonder and many more: humbleisd.net/observatory.