The Boomerang Nebula (PGC 3074547) is a protoplanetary nebula located in the constellation Centaurus. The nebula lies at an approximate distance of 5,000 light years from Earth. It has a temperature of only 1 K (-272.15°C or -458°F) and is currently the coldest known place in the universe.
The Boomerang Nebula is also known as the Centaurus Bipolar Nebula and the Bow Tie Nebula, a name it shares with the planetary nebula NGC 40 (Caldwell 2) in the constellation Cepheus.
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