Final answer:
The temperature in space at 3 K is equivalent to -270.15°C, which is close to absolute zero (-273°C) and defines the extreme coldness of outer space.
Step-by-step explanation:
The temperature in space is approximately 3 K, and to convert this into degrees Celsius, we subtract 273.15 from the Kelvin temperature. Therefore, the temperature in space in degrees Celsius is:
3 K - 273.15 = -270.15°C
All molecular motion ceases at about -273°C, a condition known as absolute zero. In this context, the temperature in space is very close to absolute zero, which is significant in astronomy and helps us to understand the coldness of the universe.