NASAのインスタグラム(nasa) - 11月26日 01時34分

310 million light years away is spiral galaxy NGC 4921, visible from NASA’s Hubble Space Telescope. Seen in this image are, from the center, a bright nucleus, a bright central bar, a prominent ring of dark dust, blue clusters of recently formed stars, several smaller companion galaxies, unrelated galaxies in the far distant universe, and unrelated stars in our Milky Way Galaxy.
A more precise determination of distance could be coupled with its known recession speed to help humanity better calibrate the expansion rate of the entire visible universe. Toward this goal, several images were taken by Hubble in order to help identify key stellar distance markers known as Cepheid variable stars. Since NGC 4921 is a member of the Coma Cluster of Galaxies, refining its distance would also allow a better distance determination to one of the largest nearby clusters in the local universe. The magnificent spiral NGC 4921 has been informally dubbed anemic because of its low rate of star formation and low surface brightness.
Image Credit: Hubble Legacy Archive, ESA, NASA
#nasa #hubble #space #astronomy #galaxy #stars #milkyway #hst #universe

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