A Waterfall of Stars

The galaxy UGCA 193, seen here by the NASA/ESA Hubble Space Telescope, is a galaxy in the constellation of Sextans (The Sextant). Looking rather like a waterfall, UGCA 193 appears to host many young stars, especially in its lower portion, creating a striking blue haze and the sense that the stars are falling from “above”.

The blue colour of UGCA 193 indicates the stars that we see are hot —  some with temperatures exceeding 6 times that of our Sun. We know that cooler stars appear to our eyes more red, and hotter stars appear more blue. As the mass and surface temperature of a star, and therefore its colour, are linked, heavier stars are able to “burn” at higher temperatures resulting in a blue glow from their surface.

Credit:

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

About the Image

Id:potw2044a
Type:Observation
Release date:2 November 2020, 06:00
Size:6462 x 6616 px

About the Object

Name:UGCA 193
Type:Local Universe : Galaxy : Type : Spiral
Distance:z=0.002 (redshift)
Constellation:Sextans
Category:Galaxies

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Coordinates

Position (RA):10 2 35.81
Position (Dec):-6° 1' 3.06"
Field of view:3.23 x 3.31 arcminutes
Orientation:North is 1.7° right of vertical

Colours & filters

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

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