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For questions related to outer space, stellar systems, stars and other astronomical phenomena.
3
votes
Would a galaxy-wide civilization have any reason to build a solar probe?
A simple probe, no, probably not. Something different, sure.
A galaxy-spanning civilization will have seen (probed) some 100 billion or so stars. Even with the ability of travelling close to the spee …
3
votes
How can I create explosions without using oxygen?
Pretty much everything used in present-day guns or cannons qualifies for that, this is why you can (in principle, neglecting other little details) fire a gun underwater or even in space no problemo. …