The Boomerang Nebula is colder than space itself
Space is cold, but one nebula beats even the Big Bang’s afterglow: the Boomerang Nebula. It’s the coldest known place in the universe, at about 1 Kelvin, or about -272°C. How does a cloud of gas get that frigid?[1][3]
Location check: it sits about 5,000 light-years away in Centaurus, and it is colder than the cosmic microwave background, the faint glow left from the Big Bang. That means it is literally colder than the background temperature of space.[3][2]
.jpeg "2023 map of the CMB.")
Why so cold? The star at its center is blasting gas outward at extreme speed, and that rapid expansion cools the nebula, much like gas cooling in a refrigerator. NASA says the outflow is what makes the region so chilly.[2][7][20]
The shape is tricky, too. Early telescopes made it look boomerang-shaped, but Hubble and ALMA showed a broader hourglass or bipolar structure, with dust and cold gas shaping the light we see.[1][11][5]
Why astronomers care: this nebula is a snapshot of a dying Sun-like star shedding its outer layers before becoming a white dwarf. It is a rare chance to study how stars die, cool, and reshape their surroundings.[5][11][6] Which fact surprised you most?[1]
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