Vibrant globular cluster sparkles in new Hubble telescope photo

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A famous telescope peered into the constellation Sagittarius to view a gorgeous assortment of candy-colored stars

The team behind the Hubble Space Telescope recently published this image of a celestial body called NGC 6717 that’s located about 20,000 light-years away from Earth. It’s a globular cluster, or a round collection of stars that are tightly held together by gravity. The stellar population is denser at the center of the globular cluster than it is at the edges, giving it its signature look. 

The view was published on Sept. 6 by the European Space Agency (ESA), which manages Hubble alongside NASA. 

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But according to the Hubble team, not all of the bright speckles in this image belong to the cluster: Some of the stars are located much closer to Earth than the distant cluster. These nearby stars are identifiable by the light spiking from their sides in a criss-cross formation, which happens when their starlight interacts with the hardware that supports Hubble’s secondary mirror, wrote ESA officials. 

Globular clusters are found across the night sky, but some are easier to study than others. Bodies like galaxy NGC 6717 fall into the latter category, because their location in the constellation Sagittarius puts them near the center of the Milky Way in the sky. The core of Earth’s home galaxy is filled with gas and dust that absorb light, making it trickier for astronomers to study the properties of this globular cluster.

To resolve this, researchers studied NGC 6717 using two Hubble instruments: its Wide Field Camera 3 and the Advanced Camera for Surveys, which collectively watch the universe across several wavelength categories from the electromagnetic spectrum. 

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