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The Pleiades and Triangulum Galaxy

13 Oct 2018, 15:57 UTC
The Pleiades and Triangulum Galaxy
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Fall is the time of year when a few deep-sky gems make their way into the night sky once again. The Pleiades, Messier 45 and the Triangulum Galaxy, Messier 33, are among the long list. The Pleiades are also well known to the unaided eye as the Seven Sisters. That is how many stars can only be seen in this open star cluster under dark skies. The image below taken on Insight Observatory's Astronomical Telescope for Educational Outreach (ATEO-1) displays many many more stars in the cluster.M45 - The Pleiades imaged at LRGB 600 sec, 2x2 bin on ATEO-1 by Insight Observatory. The cluster is dominated by hot blue and luminous stars that have formed within the last 100 million years. A faint reflection nebulosity around the brightest stars was thought at first to be left over from the formation of the cluster (hence the alternative name Maia Nebula after the star Maia), but is now likely an unrelated foreground dust cloud in the interstellar medium, through which the stars are currently passing.Computer simulations have shown that the Pleiades were probably formed from a compact configuration that resembled the Orion Nebula. Astronomers estimate that the cluster will survive for about ...

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