![]() ![]() For example: Where and how is tidal heat. ![]() Here, we use the constant-phase-lag tidal theory to explore the possibility that the new-born Moon, which formed about 69 million years (Myr) after the ignition of the Sun, generated extreme tidal friction-and therefore, heat-in the Hadean and possibly the Archean Earth. However, despite its broad ranging importance, there remain fundamental gaps in our understanding of tidal heating. For now, the faint-young-Sun paradox persists as an important problem in our understanding of the origin of life on Earth. In the deep - mantle model lo model, tidal heating occurs at the core mantle boundary beneath the polar regions. An extreme atmospheric greenhouse effect, an initially more massive Sun, release of heat acquired during the accretion process of protoplanetary material, and radioactivity of the early Earth material have been proposed as reservoirs or traps for heat. At this point, the Earth should have been a global snowball if it possessed atmospheric properties similar to those of the modern Earth. The tidal forces exerted by Jupiter on its moon Europa, for example, are thought to create enough heat to allow a liquid water ocean to exist beneath its outer ice crust. ![]() Geological evidence suggests liquid water near the Earth’s surface as early as 4.4 gigayears ago when the faint young Sun only radiated about 70% of its modern power output. Tidal heating is the heating of the interior of one planetary body caused by stresses induced from the gravitational pull of another. ![]()
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