Does Jupiter emit heat? If so, is it enough to support life on one of its moons?

Jupiter is a planet, not a star. Despite being mostly composed of hydrogen, it would take a mass greater than 13 times that of Jupiter to initiate any kind of fusion reaction that produces heat.

Nonetheless, because of its size, Jupiter uses tidal forces to warm its moons; as a result, the innermost moon, IO, experiences intense volcanic activity.

Europa, the moon of Jupiter, has an oxygen atmosphere and an icy surface. Tidal heating is thought to have caused liquid water beneath the icy surface, suggesting the possibility of life in the oceans of Europa.

Yes, Jupiter emits heat, primarily from its core. This heat is generated by the compression of gases and gravitational energy. However, the amount of heat emitted is not sufficient to support life on its moons, as Jupiter's moons are too far from the Sun to receive significant warmth and lack the necessary conditions for life as we know it. Any potential for life on Jupiter's moons would likely depend on other factors, such as subsurface oceans and chemical composition, rather than the heat emitted by Jupiter itself.