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Space
Space
Science
Sharmila Kuthunur

Stunning Hubble telescope photo reveals star-studded M55 cluster

Hubble Earth NASA Charles Messier Hubble Space Telescope
This image shows just a portion of M55, the cluster as a whole appears spherical because the stars’ intense gravitational attraction pulls them together. Hubble’s clear view above Earth’s atmosphere resolves individual stars in this cluster. Ground-based telescopes can also resolve individual stars in M55, but fewer stars are visible.

A distant cluster sparkles with ancient stars in a gorgeous new image from NASA's Hubble Space Telescope.

The dazzling Hubble photo shows just a pocket of Messier 55 (M55), a globular cluster in the constellation Sagittarius (The Archer) that harbors about 100,000 stars. Astronomers say some of these stars, especially in M55's center, twinkle with changing brightness. 

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