Boomerang Nebula
A bipolar reflection nebula that lies
about 5,000 light-years away in the constellation Centaurus.
The symmetric cloud appears to have been created by a high-speed wind of
gas and dust blowing from an aging asymptotic giant
branch (AGB) star at a speed of 164 km/s. This rapid expansion has cooled
carbon monoxide molecules in the nebular gas to a mere 1 K – colder
even than the cosmic background radiation – making it the coldest
region in the cosmos (outside a lab) ever observed. The ultracool Boomerang
shines with light from the central star reflected by dust and is believed
to be evolving rapidly, on a timescale of about 1,000 years, to the planetary
nebula stage.
| visual magnitude |
- |
| angular size |
54" |
| linear size |
~1.3 light-years (0.4 pc) |
| distance |
~5,000 light-years (1,500 pc) |
| position |
R.A. 12h 44m 46.1s,
Dec. -54° 31' 12" |
| other designations |
ESO 172-7 |
Related category
• NEBULAE
AND STAR CLUSTERS
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