Star cluster NGC 2074, lying about 170,000 light-years away near the Tarantula Nebula, observed by the Hubble Space Telescope. (HubbleSite)

Star cluster NGC 2074, lying about 170,000 light-years away near the Tarantula Nebula, observed by the Hubble Space Telescope. (HubbleSite)

A Hubble Space Telescope image of the R136 super star cluster, near the center of the 30 Doradus Nebula, also known as the Tarantula Nebula or NGC 2070.

A Hubble Space Telescope image of the R136 super star cluster, near the center of the 30 Doradus Nebula, also known as the Tarantula Nebula or NGC 2070.

This spectacular image from the NASA/ESA Hubble Space Telescope of the group of galaxies called Stephan's Quintet has provided a detailed view of one of the most exciting star forming regions in the local Universe. Stephan's Quintet is a favoured object for amateur astronomers and has earned a reputation as a challenging target for good hobby telescopes. The quintet is a prototype of a class of objects known as compact groups of galaxies and has been studied intensively for decades. This…

This spectacular image from the NASA/ESA Hubble Space Telescope of the group of galaxies called Stephan's Quintet has provided a detailed view of one of the most exciting star forming regions in the local Universe. Stephan's Quintet is a favoured object for amateur astronomers and has earned a reputation as a challenging target for good hobby telescopes. The quintet is a prototype of a class of objects known as compact groups of galaxies and has been studied intensively for decades. This…

Super Star Cluster #Westerlund2! This cluster is so massive that it is expected to eventually evolve into a globular cluster.  It hosts a dozen O-class hypergiant stars, each one with a luminosity 30,000 - 1,000,000 times greater than that of our Sun.

Super Star Cluster #Westerlund2! This cluster is so massive that it is expected to eventually evolve into a globular cluster. It hosts a dozen O-class hypergiant stars, each one with a luminosity 30,000 - 1,000,000 times greater than that of our Sun.

A star cluster once thought to be part of the spectacular Orion Nebula is actually a separate celestial entity. Scientists using the Canada-France-Hawaii Telescope in Hawaii found that the star cluster NGC 1980 is a distinct, massive bunch of stars in front of the Orion nebula, which at a range of 1,500 light-years is Earth's closest known star factory. The cluster is huddled unevenly around the star iota Ori at the southern tip of the sword in the famed Orion constellation.

A star cluster once thought to be part of the spectacular Orion Nebula is actually a separate celestial entity. Scientists using the Canada-France-Hawaii Telescope in Hawaii found that the star cluster NGC 1980 is a distinct, massive bunch of stars in front of the Orion nebula, which at a range of 1,500 light-years is Earth's closest known star factory. The cluster is huddled unevenly around the star iota Ori at the southern tip of the sword in the famed Orion constellation.

Hodge 301 Hodge 301 is a star cluster located in the Tarantula Nebula about 168,000 light years away in the Large Magellanic Cloud Galaxy. The Tarantula Nebula is a star forming region, fueled by the star clusters hidden inside.

Hodge 301 Hodge 301 is a star cluster located in the Tarantula Nebula about 168,000 light years away in the Large Magellanic Cloud Galaxy. The Tarantula Nebula is a star forming region, fueled by the star clusters hidden inside.

Globular Star Cluster M3 by Oleg Bryzgalov on Flickr.

Globular Star Cluster M3 by Oleg Bryzgalov on Flickr.

The Monkey Nebula, NGC2174 is a cloud of gas and dust that surrounds the star cluster NGC2175. The colors in this image may look like brush strokes of paint but actually represent specific wavelengths of infrared light. Particles of interstellar dust are warmed by the star cluster in the center of the nebula, which WISE (NASA's Wide-field Infrared Survey Explorer) represents by the colors green and red. The blue and cyan stars scattered throughout the image are hot compared to the dust.

The Monkey Nebula, NGC2174 is a cloud of gas and dust that surrounds the star cluster NGC2175. The colors in this image may look like brush strokes of paint but actually represent specific wavelengths of infrared light. Particles of interstellar dust are warmed by the star cluster in the center of the nebula, which WISE (NASA's Wide-field Infrared Survey Explorer) represents by the colors green and red. The blue and cyan stars scattered throughout the image are hot compared to the dust.

The Pleiades star cluster (M45) is a group of 800 stars formed about 100 million years ago. The cluster is located 410 light-years away from Earth in the constellation Taurus.

The Pleiades star cluster (M45) is a group of 800 stars formed about 100 million years ago. The cluster is located 410 light-years away from Earth in the constellation Taurus.

M45: The Pleiades Star Cluster . Explanation: Perhaps the most famous star cluster on the sky, the Pleiades can be seen without binoculars from even the depths of a light-polluted city. Also known as the Seven Sisters and M45, the Pleiades is one of the brightest and closest open clusters. The Pleiades contains over 3000 stars, is about 400 light years away, and only 13 light years across. Credit & Copyright: Robert Gendler

M45: The Pleiades Star Cluster . Explanation: Perhaps the most famous star cluster on the sky, the Pleiades can be seen without binoculars from even the depths of a light-polluted city. Also known as the Seven Sisters and M45, the Pleiades is one of the brightest and closest open clusters. The Pleiades contains over 3000 stars, is about 400 light years away, and only 13 light years across. Credit & Copyright: Robert Gendler

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