As terrifying as space is it has an abundance of a resource easily accessible vacuum. If you want to exploit an endless resource vacuum is your bitch. Hydrogen would be my second choice, it's only the one most abundant resources in our star system. And of course there's the energy from our Star an idiot would notice that one.  My personal favorite is magnetics.  Its all around us.  No reason to harm or enslave each other. Peace brothers  and sisters  humans are so much more let history's hate die with a note and forget your hates.  We need all of us to survive best.  And presently,  that's you.