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Abell 1689 is a massive cluster of galaxies located about 2.3 billion light-years away.
Abell 1689 is a massive cluster of galaxies located about 2.3 billion light-years away.
In 1995 or 1996 a supernova exploded in a nearby galaxy, but no one on Earth knew it at the time.
In 1995 or 1996 a supernova exploded in a nearby galaxy, but no one on Earth knew it at the time.
RCW 108 is a region where stars are actively forming about 4,000 light-years from Earth.
RCW 108 is a region where stars are actively forming about 4,000 light-years from Earth.
The giant galaxy, Perseus A, which is also known as NGC 1275, is a well-known source of strong radio radiation.
The giant galaxy, Perseus A, which is also known as NGC 1275, is a well-known source of strong radio radiation.
This composite of data from NASA's Chandra X-ray Observatory and the Hubble Space Telescope is another look for NGC 6543, better known as the Cat's Eye nebula.
This composite of data from NASA's Chandra X-ray Observatory and the Hubble Space Telescope is another look for NGC 6543, better known as the Cat's Eye nebula.