Dark Matter Surplus

Resting on the tail of the Great Bear in the constellation of Ursa Major, lies NGC 5585, a spiral galaxy that is more than it appears.

The many stars, and dust and gas clouds that make up NGC 5585, shown here in this Hubble image, contribute only a small fraction of the total mass of the galaxy. As in many galaxies, this discrepancy can be explained by the abundant yet seemingly invisible presence of dark matter.

The stellar disc of the galaxy extends over 35 000 light-years across. When compared with galaxies of a similar shape and size, NGC 5585 stands out by having a notably different composition: Contributing to the total mass of the galaxy, it contains a far higher proportion of dark matter.

Hotspots of star formation can be seen along the galaxy’s faint spiral arms. These regions shine a brilliant blue, contrasting strikingly against the ever-black background of space.

Credit:

ESA/Hubble & NASA, R. Tully
Acknowledgement: Gagandeep Anand

About the Image

Id:potw2038a
Type:Observation
Release date:21 September 2020, 06:00
Size:6568 x 6709 px

About the Object

Name:NGC 5585
Type:Local Universe : Galaxy : Type : Spiral
Constellation:Ursa Major
Category:Galaxies

Image Formats

Large JPEG
17.3 MB
Screensize JPEG
645.0 KB

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Wallpapers

1024x768
556.1 KB
1280x1024
921.8 KB
1600x1200
1.3 MB
1920x1200
1.6 MB
2048x1536
2.1 MB

Coordinates

Position (RA):14 19 49.61
Position (Dec):56° 43' 33.93"
Field of view:3.28 x 3.35 arcminutes
Orientation:North is 117.6° right of vertical

Colours & filters

BandWavelengthTelescope
Optical
V
606 nm Hubble Space Telescope
ACS
Optical
I
814 nm Hubble Space Telescope
ACS

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