This image from NASA’sHubble Space TelescopeshowcasesMessier 3, one of the Milky Way galaxy’s most massive globular clusters, or spherical collections of gravitationally bound stars.
Globular clustersare made up of ancient stars that formed at roughly the same time from the same cloud of gas, giving those stars similar ages.
Around 150 known globular clusters are sprinkled around the outer regions of the Milky Way.
Learn more about M3.
Image credit: NASA, ESA, and A. Sarajedini; Processing: Gladys Kober