Marcus 2012

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NASA aviation & alternative fuels workshop

Green ships and blue waters

Advanced space propulsion concepts for interstellar travel

A new era for electric propulsion

Hollow earth art & recap

A hollow earth the inhabitants

The science behind journey to the center of the earth

Scientific method vs. hollow earth theory

Origins of mordern astronomy

Hollow earth, contrails & global warming calculations lecture

Geologic time primer & carbon dating review

Earth – moon gravity primer