While visions of Mars colonies, floating cities above Venus, and humans exploring distant moons inspire wonder, the reality ...

There's an asymmetry there though—it's cheaper coming down than going up. If you're after raw materials, then in principle you don't need to put that much mass in space to bring a lot of mass back to ...

What makes colonizing Mars a good idea? Kim Stanley Robinson’s Mars trilogy Is probably the best example but it mostly uses the backdrop of Mars as a plot device ...