this post was submitted on 30 Sep 2023
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About 4.5 billion years.
Just 4 billion? Pfft! I’ll stick with fossil fuels, thanks!
At least until vacuum or dark energy is readily available. Gotta plan for the eventual heat death of the universe ya know.
"We" may be able to explore the cosmos without leaving home.
Or, given 10 million years head start plus building time, you could use a Caplan Thruster stellar engine to make that 100% sure