This week’s image from the Hubble Space Telescope shows a stunning field of stars called a globular cluster. Taken with Hubble’s Wide Field Camera 3 and Advanced Camera for Surveys instruments, the view captures the beautiful depths of the globular cluster NGC 6569, located in the constellation of Sagittarius.
“Globular clusters are stable, tightly bound clusters containing tens of thousands to millions of stars, and are associated with all types of galaxies,” Hubble scientists explain. “The intense gravitational attraction of these closely packed clusters of stars means that globular clusters have a regular spherical shape with a densely populated center — as can be seen in the heart of this star-studded image.”
Globular clusters are found in most galaxies, and there are many in our galaxy of the Milky Way. The globular clusters in our galaxy, like those in other spiral galaxies, are found mostly at the outer edges of the galaxy in a region called the galactic halo. These clusters tend to be larger and older than clusters found elsewhere.
But there are globular clusters in other areas as well, including those closer to the center of the galaxy. To learn more about these huge groups of stars, Hubble has been collecting data on a set of globular clusters which are close to the center of the Milky Way.
It is hard to see in the region at the center of the Milky Way, as there is a lot of dust there which gets in the way of observations by blocking off light and changing the color of the light which can be seen. To address this, Hubble scientists combined both data collected by the telescope’s instruments are data from astronomical archives so they could better understand both the age and the structure of these globular clusters.
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