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metal prints spiral metal prints arms metal prints nucleus metal prints hst metal prints hubble space telescope metal prints image metal prints astronomical metal prints astrophysics metal prints astrophysical metal prints cosmological metal prints 2003 metal prints ngc 3370 metal prints cepheid variables metal prints variable metal prints distance metal prints

photographs spiral photos arms photos nucleus photos hst photos hubble space telescope photos image photos astronomical photos astrophysics photos astrophysical photos cosmological photos 2003 photos ngc 3370 photos cepheid variables photos variable photos distance photos

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Spiral galaxy NGC 3370, HST image. This galaxy is around 98 million light years from Earth. It has a nucleus of mainly older yellower stars, surrounded by spiral arms containing younger, hotter, bluer stars. This galaxy was home to a type 1a supernova in 1994. Such supernovae have a known brightness, which allows their distance to be calculated. Studying type 1a events in galaxies provides information about the expansion of the universe. This image was taken in 2003 during a survey of Cepheid variable stars in the galaxy, the most distant such stars ever measured at the time. Cepheids provide very accurate distance data.

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