I get so confused how mass works in space. I know these may sound like stupid questions but I've never had anyone answer them before. First if you're flying a spacecraft around in space. What role does mass play if you're weightles? For example why couldn't you hit the gas and indefinitely accelerate to however fast you wanted to go? I guess another question is in space what forces act on mass if there is no friction wind resistance or gravity? Is there a good link to a website that explores these questions?