What’s a globular cluster? The Milky Way has about 150

What’s a globular cluster? The Milky Way has about 150

The Hubble Space Telescope captured this close-up, off-center image of the globular cluster M5 in 2015. Image via HST/ NASA/ ESA/ APOD. Globular clusters contain the most ancient stars in our Milky Way. They are huge, symmetrical groups of stars that are packed closely together in space. They look like round fuzzy balls when seen through telescopes. Stars in globular clusters probably formed first, as our galaxy was forming. A globular cluster …