How cold is interstellar space?

Related questions

1. What is a stellar day?
2. What is a Tesseract in interstellar?
3. Why is space cold?
4. How does interstellar travel work?
5. What is the meaning of Stella?
6. Who put the wormhole in interstellar?
7. How long is a stellar day?
8. How long will it take Voyager 1 to travel a light year?
9. What is meant by interstellar space?
10. Can you see Voyager 1 from Earth?

Tags

1. #minimum
2. #which
3. #microwave
4. #permeates
5. #space
6. #travel
7. #temperature
8. #lower
9. #celsius
10. #everything
11. #radiation
12. #entire
13. #never
14. #kelvin
15. #cosmic
16. #universe
17. #background