| http://www.w3.org/ns/prov#value | - Yet the effect of tidal heating on these worlds, resulting possibly, in cases such as Europa and Callisto, in the existence of large amounts of sub-surface liquid water, makes them biologically interesting.1 Were life to be discovered on one of Jupiter's moons, the outer margin of the Sun's HZ would be pushed out to almost 800 million km (500 million miles).
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