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Comets preserve the earliest material of the solar nebula and potentially carry the complex organic molecules necessary for life.
Comets
Halley’s comet
Philae Lander
Comets are composed of rock, dust, ice and frozen gases such as CO2, CO, CH44 and NH3. plus complex organic molecules.
First image from Agilkia
The first image from the surface. View of a clff or side of a very deep hole
Phanerozoic Ice Ages and CO2
Four ice ages in the last 540 million years. Neoproterozoic (850-630 Ma) Snowball Earth
Current CO2 levelsrelatively low in the context of Earth history
Milankovitch Cycles and the Quaternary Ice Age
Current Ice Age started at 2.6 Ma
Earth has been in an interglacial for 11,000 years
Estimated world energy reserves
A world dominated by Nuclear Energy?
1 Quad = 1 quadrillion BTU
1 BTU = 252 calories
Nuclear Energy
Chain reaction
Neutron collides with U235 forming krypton and barium and releasing more neutrons + vast amounts of energy
Formation of Unconformity-type Uranium Deposits
2U6+ + + 2H2O + C = 2U4+ + 2H+ + CO2
U4+ + O2 = UO2 (Uraninite)