# Cosmic Freezer (DD-752)

> The coldest place in the universe isn't the void between galaxies. It's a dying star's breath, 5,000 light-years away, at 1 K (-272 °C).

- Department: Space
- First published: 2026-10-17
- Last updated: 2026-10-17
- Permalink: https://detailenjoyer.com/case/coldest-place-universe-v2/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## On the timeline

- **1995**: Sahai and Nyman measure the Boomerang Nebula with the SEST radio telescope in Chile

Full timeline: https://detailenjoyer.com/timeline/?case=coldest-place-universe-v2

## Quick facts

- **DD-752-F01**: The Boomerang Nebula: A cloud of gas blown off by a dying star, about 5,000 light-years away in Centaurus. _(Slide 02 · Exhibit A)_
- **DD-752-F02**: 1 Kelvin: That's -272 °C / -458 °F. Just one degree above absolute zero. _(Slide 03 · Exhibit B)_
- **DD-752-F03**: Colder than space: The Big Bang's afterglow keeps empty space at about 2.7 K. The Boomerang is colder. _(Slide 04 · Exhibit C)_
- **DD-752-F04**: The only one: It's the only known natural object colder than the cosmic background. _(Slide 05 · Exhibit D)_
- **DD-752-F05**: Found in 1995: Sahai and Nyman measured it with the 15-metre SEST radio telescope in Chile. _(Slide 06 · Exhibit E)_
- **DD-752-F06**: 164 km per second: Its star blasts gas outward at over 500,000 km/h. _(Slide 07 · Exhibit F)_
- **DD-752-F07**: 1/1,000 of a Sun: That's how much mass it sheds every year, for at least 1,500 years. _(Slide 08 · Exhibit G)_
- **DD-752-F08**: A cosmic fridge: The gas expands so fast it chills itself. Same trick as your refrigerator. _(Slide 09 · Exhibit H)_

## Write-up

The coldest place in the universe isn't empty space. It's a dying star 5,000 light-years away.

1. **The Boomerang Nebula**: A cloud of gas blown off by a dying star, about 5,000 light-years away in Centaurus.
2. **1 Kelvin**: That's -272 °C / -458 °F. Just one degree above absolute zero.
3. **Colder than space**: The Big Bang's afterglow keeps empty space at about 2.7 K. The Boomerang is colder.
4. **The only one**: It's the only known natural object colder than the cosmic background.
5. **Found in 1995**: Sahai and Nyman measured it with the 15-metre SEST radio telescope in Chile.
6. **164 km per second**: Its star blasts gas outward at over 500,000 km/h.
7. **1/1,000 of a Sun**: That's how much mass it sheds every year, for at least 1,500 years.
8. **A cosmic fridge**: The gas expands so fast it chills itself. Same trick as your refrigerator.

## Related case files

- [Stellar Birth (DD-037)](https://detailenjoyer.com/case/stellar-birth/): I paired it with the cold clouds where stars are born
- [Quantum Infrastructure (DD-012)](https://detailenjoyer.com/case/quantum-cryogenics/): I linked the fridges that chase temperatures near absolute zero on Earth
- [Mercury (DD-133)](https://detailenjoyer.com/case/mercury/): I linked more extreme cold

## Questions & answers

**Q: About how cold is the Boomerang Nebula?**  
A: About 1 Kelvin, or -272 °C / -458 °F, one degree above absolute zero. _(Source: Slide 03 · Exhibit B (1 Kelvin))_

**Q: What keeps empty space at about 2.7 K?**  
A: The Big Bang's afterglow keeps space at about 2.7 K, and the Boomerang is colder than that. _(Source: Slide 04 · Exhibit C (Colder than space))_

**Q: Which telescope did Sahai and Nyman use to measure it in 1995?**  
A: Sahai and Nyman found it in 1995 with the 15-metre SEST radio telescope in Chile. _(Source: Slide 06 · Exhibit E (Found in 1995))_

**Q: How does the nebula get so cold?**  
A: The gas expands so fast it chills itself, the same trick a refrigerator uses. _(Source: Slide 09 · Exhibit H (A cosmic fridge))_

**Q: How fast does its star blast gas outward?**  
A: About 164 km per second, which is over 500,000 km/h. _(Source: Slide 07 · Exhibit F (164 km per second))_

## Sources

- [jpl.nasa.gov](https://www.jpl.nasa.gov/news/boomerang-nebula-boasts-the-coolest-spot-in-the-universe/)
- [esa.int](https://www.esa.int/Science_Exploration/Space_Science/Extreme_space/Coldest_place_in_the_Universe)
- [iopscience.iop.org](https://iopscience.iop.org/article/10.1086/310897)
- [almaobservatory.org](https://www.almaobservatory.org/en/press-releases/alma-reveals-ghostly-shape-of-coldest-place-in-the-universe/)
- [science.nasa.gov](https://science.nasa.gov/missions/hubble/boomerang-nebula/)

## Cite this case file

Easterling, Marcus. "Cosmic Freezer." The Detail Department (DetailEnjoyer), case file DD-752, last updated Oct 17, 2026. https://detailenjoyer.com/case/coldest-place-universe-v2/