Dark Matter in the Belly of the Whale

This image, taken with the NASA/ESA Hubble Space Telescope, focuses on an object named UGC 695, which is located 30 million light-years away within the constellation Cetus (The Sea Monster), also known as The Whale.

UGC 695 is a low-surface-brightness (LSB) galaxy. These galaxies are so faint that their brightness is less than the background brightness of Earth’s atmosphere, which makes them tricky to observe. This low brightness is the result of the relatively small number of stars within them — most of the baryonic matter in these galaxies exists in the form of huge clouds of gas and dust. The stars are also distributed over a relatively large area.

LSB galaxies, like dwarf galaxies, have a high fraction of dark matter relative to the number of stars they contain. Astronomers still debate about how LSB galaxies formed in the first place.

Credit:

ESA/Hubble & NASA, D. Calzetti

About the Image

Id:potw1936a
Type:Observation
Release date:9 September 2019, 06:00
Size:3113 x 2000 px

About the Object

Name:UGC 695
Type:Local Universe : Galaxy
Distance:30 million light years
Constellation:Cetus
Category:Galaxies

Image Formats

Large JPEG
2.3 MB
Screensize JPEG
167.1 KB

Zoomable


Wallpapers

1024x768
262.0 KB
1280x1024
483.3 KB
1600x1200
730.7 KB
1920x1200
857.4 KB
2048x1536
1.2 MB

Coordinates

Position (RA):1 7 46.45
Position (Dec):1° 3' 49.46"
Field of view:2.06 x 1.32 arcminutes
Orientation:North is 123.6° right of vertical

Colours & filters

BandWavelengthTelescope
Optical
B
438 nm Hubble Space Telescope
WFC3
Optical
V
555 nm Hubble Space Telescope
WFC3
Optical
I
814 nm Hubble Space Telescope
WFC3

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