"A compass in space is going to measure different things [depending on] where exactly in space you are," Jared Espley, a planetary scientist at NASA Goddard Space Flight Center in Maryland, told Live Science. A compass would still technically work in space, but it wouldn't necessarily point you back to Earth. Instead, it would point to the north pole of whatever magnetic field is the strongest, relative to where in space the compass is located. Read more: https://www.livescience.com/space/where-would-a-compass-point-in-outer-space