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The galaxy UGCA 193, seen here by the 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 color 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.
Image Credit: ESA/Hubble and NASA, R. Tully
Acknowledgement: Gagandeep Anand
Image enhancement: Jean-Baptiste Faure
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