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The Pleiades Deep and Dusty

The well-known Pleiades star cluster is slowly destroying part of a passing cloud of gas and dust. The Pleiades is the brightest open cluster of stars on Earth's sky and can be seen from almost any northerly location with the unaided eye. Pressure from the stars' light significantly repels the dust in the surrounding blue reflection nebula, with smaller dust particles being repelled more strongly. A short-term result is that parts of the dust cloud have become filamentary and stratified. The featured deep image also captured Comet C/2015 ER61 (PanSTARRS) on the lower left.
Image Credit: Juan Carlos CasadoTWANEarth & StarsFECYT

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What's a Globular Cluster?

Globular cluster is a spherical collection of stars that orbits a galaxy as a satellite. Globular clusters are very closely held by gravity, which gives them their spherical dense structures. Globular clusters are sometimes called with a shorter name, just globulars.

There are over 150 globular clusters in our home galaxy. Andromeda galaxy may have as much as 500 of them. Some giant elliptical galaxies, such as M87, may contain as many as 13,000 globular clusters. These clusters orbit their galaxies at a distance of up to 131,000 light-years. Almost every galaxy surveyed contain a system of globular clusters.

Sources:

http://en.wikipedia.org/wiki/Globular_cluster

Image source: NASA, http://nssdc.gsfc.nasa.gov/image/astro/hst_abell2218.jpg

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