Hubble Space Telescope Views Lonely Spiral Galaxy astronomy space science
Also known as DDO 193, LEDA 52091 and SDSS J143437.01+592016.1, the galaxy is not a member of any group of galaxies and is“The star-studded spiral arms of UGC 9391 stand in splendid isolation against a backdrop of distant galaxies, which are only visible as indistinct swirls or smudges thanks to their vast distances from Earth,” Hubble astronomers said.
“Astronomical distances are only directly measurable for relatively nearby objects — closer than 3,000 light-years or so.” “For distances beyond this, we rely on a set of measured correlations calibrated against nearby objects.” “UGC 9391 helped us improve our distance estimates by providing a natural laboratory in which to compare two measuring techniques — supernova explosions and Cepheid variables,” they said.
“Improving the precision of distance measurements helps us quantify how quickly the Universe is expanding — one of Hubble’s key science goals.”
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