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Spiral galaxy M100 in Coma Berenices
Messier 100 - Grand Design Splendor
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Name: M 100, Messier 100, NGC 4321
Description: Spiral Galaxy
Position: RA 12h 22m 54.92s Dec 15° 49' 20.11"
Constellation: Coma Berenices
Distance: 55 million light years
Apparent Dimensions: 7.4' × 6.3'
Diameter: 160,000 light-years
Visual Magnitude: 10.1
Field of view: 5.26 x 3.94 arcminutes
Orientation: North is 0.1° left of vertical
Image Credit: ESO
Release Date: July 29, 2013

Full View:G0913  Closeup:G1330  Galactic Core:G1203  Infrared:  G1042
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Spiral galaxies are usually very aesthetically appealing objects, and never more so than when they appear face-on. And this image is a particularly splendid example: it is the grand design spiral galaxy Messier 100, located in the southern part of the constellation of Coma Berenices, and lying about 55 million light-years from Earth. It was discovered by Pierre Méchain on March 15, 1781 and was subsequently entered in Messier's catalogue of nebulae and star clusters after Charles Messier made observations of his own on April 13, 1781.

While Messier 100 shows very well defined spiral arms, it also displays the faintest of bar-like structures in the center, which classifies this as type SAB. Although it is not easily spotted in the image, scientists have been able to confirm the bar's existence by observing it in other wavelengths.

This very detailed image shows the main features expected in a galaxy of this type: huge clouds of hydrogen gas, glowing in red patches when they re-emit the energy absorbed from newly born, massive stars; the uniform brightness of older, yellowish stars near the center; and black shreds of dust weaving through the arms of the galaxy.

Messier 100 is one of the brightest members of the Virgo Cluster, which is the closest cluster of galaxies to our galaxy, the Milky Way, containing over 2000 galaxies, including spirals, ellipticals, and irregulars. This picture is a combination of images from the FORS instrument on ESO's Very Large Telescope at Paranal Observatory in Chile, taken with red (R), green (V) and blue (B) filters.