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| Description: Two Supernovae in NGC 664 In 1997, the rareoccurrence of two supernovae in the same galaxy at the same time was observed in the spiral galaxy NGC 664, located about 300 Mly (90 Mpc) from Earth. Supernovae observed in remote galaxies are important standard candles used by astronomers to determine the distances to these faraway objects. The two supernovae overlap each other, as shown. The upper, yellow-orange supernova was observed to occur 2 months before the hotter, blue one, which was observed to occur less than 2 weeks before this image was made and had not yet achieved maximum brightness. Picture Stats: Views: 564 Filesize: 261.18kB Height: 900 Width: 900 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18747 |