In article
,
Matt Casey wrote:

Return to the Moon and colonize it, go to Mars, colonize it, go
to the other planets in the Solar System, and go to the stars?

Not until we achieve some major breakthroughs in propulsion -- exotic
stuff like antigravity, free energy, etc.

OTW, the expenses of supporting colonies on the Moon and Mars would be
prohibitive.

Think of Antarctic research times 100.

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