it can be used by astronomers in space of course, bitcoin runs in the internet world. of course there are internet in outer space but based on the video article by the astronomers it has a weak signal. which means it could transact bitcoin slower than here in the world but they can access it i think. they can use as here in bitcointalk.org but i bet they cannot mine due to the weak signal even if internet consume a little bit of internet i guess.  they can participate in campaigns and other things. such as gambles and trading i guess. but no doubt. they can access it.