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चित्र:Meeting the neighbours.jpg

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सारांश

वर्णन
English: There are many galaxies in the Universe and although there is plenty of room, they tend to stick together. The Milky Way, for example, is part of a large gathering of over fifty galaxies known as the Local Group. Galaxy groups like this come together to form even larger groups called clusters which can congregate further still to create mammoth superclusters.

The sphere of space surrounding our galaxy is known as the Local Volume, a region some 35 million light-years in diameter and home to several hundred known galaxies. The subject of this new NASA/ESA Hubble Space Telescope image, a beautiful dwarf irregular galaxy known as PGC 18431, is one of these galaxies.

This image shows PGC 18431 smudged across the sky, but it wasn’t imaged purely for its looks. These Hubble observations were gathered in order to probe how Local Volume galaxies cluster together and move around. Hubble’s high resolution allows astronomers to explore star populations within these moderately distant galaxies — specifically, stars known as tip of the red-giant branch stars — in order to get an idea of the galaxy’s composition and, crucially, its distance from us. Knowing galactic distances enables us to accurately map a galaxy sample in three dimensions, a method key to understanding more about our cosmic neighbours, and to dismiss perspective and line-of-sight illusions.
दिनांक
स्रोत http://www.spacetelescope.org/images/potw1523a/
लेखक ESA/Hubble & NASA

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रोपण
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w:en:Creative Commons
रोपण
This file is licensed under the Creative Commons Attribution 4.0 International license.
रोपण: ESA/Hubble
तुम्ही मुक्त आहात.
  • सामायिक करा – नक्कल, वितरण आणि पारेषित करण्यास
  • पुर्नमिश्रीत करण्यास – काम गरजेनुसार अनुकुलीत करण्यास
खालील अटींच्या अधिन राहून:
  • रोपण – आपण योग्य क्रेडिट देणे आवश्यक आहे, परवान्यास दुवा प्रदान करणे आवश्यक आहे, आणि बदल केले गेले आहेत हे दर्शविणे आवश्यक आहे. आपण हे कोणत्याही वाजवी मार्गाने करू शकता, परंतु परवानाधारक आपल्यास किंवा आपल्या वापरास मान्यता देतो अशा कोणत्याही मार्गाने नाही.

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८ जून 2015

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