EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY
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Globular star cluster NGC 6397. This star cluster is located 7200 light years away in the constellation Ara. It has a very densely packed core, making star collisions relatively common. The collision of 2 or 3 old yellow stars forms new stars called blue stragglers. At top left is a red giant, an expanding star that has run out of hydrogen fuel. Photographed by the Wide-Field- Imager on the ESO/MPI 2.2m telescope at the La Silla Observatory, Chile. THIS IMAGE MAY NOT BE USED BY OR TO PROMOTE THE ARMS, NUCLEAR POWER OR TOBACCO INDUSTRIES OR ANY RELIGIOUS ORGANISATION, OR IN ANY DISCRIMINATORY WAY, OR TO IMPLY THE ENDORSEMENT BY ESO OF ANY PRODUCT, SERVICE OR ACTIVITY.
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