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/* Solar Fusion */
Could someone add some numbers to this? For me, it sounds just wrong, and I couldn't find any source for it. It's something different from the [[Faint young Sun problem]], I suppose. [[User:FrankC|FrankC aka ComedyFan]] 11:02, 28 June 2010 (EDT)
== Geothermal Activity ==
''The interior of the earth is heated by decay of radioactive isotopes, which could not possibly still be persisting in sufficient quantities after 5 billion, or even half a billion, years.''
Why not? [[User:FrankC|FrankC aka ComedyFan]] 11:12, 28 June 2010 (EDT)
