This spectacular star-studded image shows the heart of the globular cluster NGC 6638 in the constellation Sagittarius. Captured by the NASA/ESA Hubble Space Telescope, this star-strewn observation highlights the density of stars at the heart of globular clusters, which are stable, tightly bound clus
This star-studded Hubble Space Telescope image shows the heart of the globular cluster NGC 6638 in the constellation Sagittarius. To capture the data in this image, Hubble used two of its cutting-edge astronomical instruments: Wide Field Camera 3 and the Advanced Camera for Surveys. Credit: ESA/Hubble & NASA, R. CohenNGC 6638 in the constellation Sagittarius.
Since it is almost impossible to clearly distinguish the stars in globular clusters with ground-based telescopes, Hubble revolutionized the study of globular clusters. Earth’s atmosphere causes blurring that makes it impossible to tell one star from another, but from Hubble’s location in low Earth orbit, the atmosphere is no longer a concern.
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