Protoplanetary Nebula

Boomerang Nebula

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boomerang nebula,protoplanetary nebula,centaurus bipolar nebula

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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Calabash Nebula (Rotten Egg Nebula)

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rotten egg nebula,OH231.8+4.2

Calabash Nebula, more famously known as the Rotten Egg Nebula, is a bipolar protoplanetary nebula located in the constellation Puppis. The nebula lies at an approximate distance of 4,200 light years from Earth. Its official designation is OH 231.8+4.2.

The Calabash Nebula is about 1.4 light years long and has a radius of 0.7 light years. With an apparent magnitude of 9.47, it can only be seen in telescopes.
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