How cold is the vacuum of space?
This is a complicated question. In a true vacuum there is nothing to transfer heat. Without heat transfer there can't be a temperature the way we understand it. If you have something to transfer heat it would be totally dependent on radiant heat from nearby stars.
The coldest the vacuum of space can get is 2.7 degrees Kelvin or -270.45 degrees Celsius. This is the temperature of the cosmic microwave background radiation.
Join Alexa Answers
Help make Alexa smarter and share your knowledge with the worldLEARN MORE