Our existence here isn't guaranteed. Spreading out raises our chances our survival. But you're right. What we get from space is intangible. And that shouldn't

Our existence here isn't guaranteed. Spreading out raises our chances our survival. But you're right. What we get from space is intangible. And that shouldn't be underestimated. Visionary projects expand horizons; they're the essence of life; And that's just what "we" need. A Mars missions must be manned, for these reasons. Sending robots is killing NASA; the public isn't interested. We don't need another burning Alexandria. We need a big project, we need growth, we need to show our vitality.