 We're curious creatures. We want to explore things. We want to uncover the mysteries of the world in which we live, including the world that goes beyond our planet. So there is that aspect that seems to be an important driver, and not one I think that should be scoffed at. I think it's an important aspect of human beings. There are other all sorts of things that interest us. It's not lost on us that there might be potential benefits for us earthlings of being able to explore space, both mineral resources looking more distantly into the future, the possibility of living on places other than our own planet. If you think of the earth as relatively finite, so at some point or another, it's not going to be habitable by human beings. And if you think that the contributing to the furtherance of humanity indefinitely into the future is an important goal. Then that would give you a pretty powerful moral reason to want to engage in exploration to explore the possibility of human beings being able to live someplace other than an ultimately expiring planet that we currently live on. I mean at a limit you might think that if you think that the most important thing is that there be human beings and happy human beings on into the future indefinitely. If you look at it that way, given a certain type of moral view, you might think that that's the absolute most important thing that we should be trying to do, because of course we would be taking on opportunity costs of not addressing issues like global poverty in our lifetimes, but we'd potentially be benefiting billions and billions and billions of people into the future insofar as we're enlarging the capacity of human beings to live within it.