It's been nearly four years since the Japanese spacecraft Hayabusa-2 blasted off, heading for a small asteroid that ...
It's time to stop sending up so much garbage.
But that's not too weird for the red planet.
More than a light Venusian breeze.
Something's got the Kuiper belt's rocks off, and there's a scramble to find it.
Life as we know it probably wouldn't exist.
Our best guess for what it would take to get to planets that are really, really far away.