Spiral galaxy NGC 3370

Spiral galaxy NGC 3370

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Caption: 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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Keywords: 2003, arms, astronomical, astronomy, astrophysical, astrophysics, cepheid variables, cosmological, cosmology, distance, expansion, face on, galactic, galaxy, hst, hubble space telescope, image, measuring, ngc 3370, nucleus, optical, science, spiral, supernovae, type 1a supernova, universe, variable, visible

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