Most Distant 'Standard Candle' Star Explosion Found

SPACE.com
Most Distant 'Standard Candle' Star Explosion Found
Supernova SCP-0401, which is about 10 billion light-years from Earth, was spotted by the Hubble Space Telescope in 2004 but could not be positively identified until after the 2009 installation of a new camera that acquired more data.
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