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View submission: Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
I suppose the question is what you mean by deep space. Even if you were, say, between the Andromeda and Milky Way galaxies, you would manage to see an outline of your hands over pitch darkness (after a long period of letting your eyes adjust). But there are voids that are bigger where this would be much more challenging!
In our own galaxy, if you’re floating close enough to a star you’d probably see them just fine. However if you were in a very dense nebula, you wouldn’t see them because all the light would be blocked.
There's nothing here!