As any web search will reveal, most of my research contributions have been in the fields of in-space propulsion, SETI, Earth-protection from asteroid impacts, planetary atmospheres, extra-solar planet detection and spacecraft navigation. Since I have consulted for NASA on solar-sail applications, I have trained myself to err on the side of conservatism. However, a true scientist cannot ignore observational data. He or she must base hypothesis and theories upon such results, not upon previous experience, ideology and dogma.
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