At times crew members engage in philosophical discussions, where fundamental questions are asked. What does it mean for our planet to be—presumably—the only one to sustain life in this galaxy and galaxies beyond? What does it mean if we’re not the only such life-form? Harvey also brilliantly captures the air of camaraderie these men and women depend upon to survive.

Mars has become a very busy place, being orbited by satellites and crisscrossed by Land Rovers. As if that's not enough, Curiosity, a roving science laboratory, just successful landed at the planet's ancient crater to probe for signs that the planet was life-friendly in the past. Indeed, we are mapping and processing our neighboring planet so extensively that it feels as if Mars has already been colonized.