From the December 2012 issue

What are the coldest places in the solar system?

Doug Kaupa, Beavercreek, Ohio
By | Published: December 21, 2012 | Last updated on May 18, 2023
Location   Coldest temperature   Date measured  
 Triton  38K (–235° C, –391° F)  1989
 (Voyager 2)
 Pluto  37 K (–236° C, –393° F)  2005-2010
 (Submillimeter Array)
 Eris  <36 K (–237° C, –395° F)  2011
 (Institute for Radio Astronomy
 at Millimeter wavelengths)
 Moon (craters
 near pole)
 25 K (–248° C, –415° F)  2010
 (Lunar Reconnaissance Orbiter)
 Interstellar
 space
 2.73 K (–270° C, –455° F)  2000
 (BOOMERanG)

Key: K = Kelvin; C = Celsius; F = Fahrenheit