File:Invisible X-rays (46686990644).jpg

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DescriptionInvisible X-rays (46686990644).jpg	This fuzzy orb of light is a giant elliptical galaxy filled with an incredible 200 billion stars. Unlike spiral galaxies, which have a well-defined structure and boast picturesque spiral arms, elliptical galaxies appear fairly smooth and featureless. This is likely why this galaxy, named Messier 49, was discovered by French astronomer Charles Messier in 1771. At a distance of 56 million light-years, and measuring 157 000 light-years across, M49 was the first member of the Virgo Cluster of galaxies to be discovered, and it is more luminous than any other galaxy at its distance or nearer. More information: <a href="https://www.spacetelescope.org/images/potw1911a/" rel="noreferrer nofollow">www.spacetelescope.org/images/potw1911a/</a> Credit: ESA/Hubble & NASA, J. Blakenslee, P Cote et al.
Date	17 December 2018, 09:27
Source	Invisible X-rays
Author	Hubble ESA

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This image was originally posted to Flickr by Hubble Space Telescope / ESA at https://flickr.com/photos/51268976@N08/46686990644. It was reviewed on 7 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2020

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Credit/Provider	ESA/Hubble & NASA, J. Blakenslee, P Cote et al.
Source	ESA/Hubble
Short title	Invisible X-rays
Image title	This fuzzy orb of light is a giant elliptical galaxy filled with an incredible 200 billion stars. Unlike spiral galaxies, which have a well-defined structure and boast picturesque spiral arms, elliptical galaxies appear fairly smooth and featureless. This is likely why this galaxy, named Messier 49, was discovered by French astronomer Charles Messier in 1771. At a distance of 56 million light-years, and measuring 157 000 light-years across, M49 was the first member of the Virgo Cluster of galaxies to be discovered, and it is more luminous than any other galaxy at its distance or nearer. Elliptical galaxies tend to contain a larger portion of older stars than spiral galaxies and also lack young blue stars. Messier 49 itself is very yellow, which indicates that the stars within it are mostly older and redder than the Sun. In fact, the last major episode of star formation was about six billion years ago— before the Sun was even born! Messier 49 is also rich in globular clusters; it hosts about 6000, a number that dwarfs the 150 found in and around the Milky Way. On average, these clusters are 10 billion years old. Messier 49 is also known to host a supermassive black hole at its centre with themass of more than 500 million Suns, identifiable by the X-rays pouring out from the heart of the galaxy (as this Hubble image comprises infrared observations, these X-rays are not visible here).
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	06:00, 18 March 2019
Software used	Adobe Photoshop CC 2018 (Windows)
File change date and time	09:27, 17 December 2018
Date and time of digitizing	21:10, 2 May 2018
Date metadata was last modified	10:27, 17 December 2018
Unique ID of original document	xmp.did:e532b001-10c0-0a47-afb6-f31ce890b766
Keywords	Messier 49
Contact information	http://www.spacetelescope.org Karl-Schwarzschild-Strasse 2 Garching bei München, None, D-85748 Germany
IIM version	4

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