Image of the Day: Be dazzled by the Milky Way's densest star cluster

If your June sky view today is obscured by pesky clouds, check out this spectacular starry image, captured by the Hubble Space Telescope, of the Arches Cluster.  This young (2-4 million years old) mega-congregation of brilliant stars is located 25,000 light-years away from Earth and is believed to be the most dense accumulation in our Milky Way galaxy.  It's an awe-inspiring photo that makes you think there just might be someone out there winking at us ... or launching an invasion armada.

Here's a detailed explanation of the cosmic image by NASA and the European Space Agency:

The Arches cluster is so dense that in a region with a radius equal to the distance between the sun and its nearest star there would be over 100,000 stars! At least 150 stars within the cluster are among the brightest ever discovered in the Milky Way. These stars are so bright and massive that they will burn their fuel within a short time (on a cosmological scale that means just a few million years). Then they will die in spectacular supernova explosions. Due to the short lifetime of the stars in the cluster the gas between the stars contains an unusually high amount of heavier elements, which were produced by earlier generations of stars.

Despite its brightness the Arches Cluster cannot be seen with the naked eye. The visible light from the cluster is completely obscured by gigantic clouds of dust in this region. To make the cluster visible astronomers have to use detectors which can collect light from the X-ray, infrared, and radio bands, as these wavelengths can pass through the dust clouds. This observation shows the Arches Cluster in the infrared and demonstrates the leap in Hubble’s performance since its 1999 image of same object.

(Via io9)

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