M 4 Globula Cluster in Scorpius

Numéro d’image : 12582693
M 4 Globula Cluster in Scorpius
M4 (also designated NGC 6121) is a globular cluster in the constellation of Scorpius. It was discovered by Philippe Loys de Cheseaux in 1745 and later catalogued by Charles Messier. It was the first globular cluster in which individual stars were resolved. M4 appears about the same size as the Moon in the sky. It measures 75 light years across. The Hubble Space Telescope revealed white dwarf stars in M4 that are among the oldest known stars in the Milky Way Galaxy at an age of 13 billion years. One such white dwarf has been found to be a binary star with a pulsar companion, PSR B1620-26 and a planet orbiting it with a mass of 2.5 times that of Jupiter. In 1987 a millisecond pulsar was discovered in M4 with a period of 3 milliseconds. This image was created from photographic material taken with the 1.22-metre UK Schmidt Telescope at Anglo-Australian Observatory, forming part of the Digitized Sky Survey 2.
Licence : Droits gérés
Crédit: Science Photo Library / De Martin, Davide
Taille de l’image : 5659 px × 6176 px
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