The Boomerang Nebula, some 5 000 light years from Earth in the constellation Centaurus, is the coldest natural object in the universe found so far. Its temperature is approximately −272°C, just one degree above absolute zero, or zero kelvin (0 K). Even the temperature of outer space – more correctly, the Cosmic Microwave Background Radiation – is a slightly warmer 2.7 K.
- Quest Vol. 16 No. 3 is now available!
- Journey to the sea ice