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Before you go to Mars, step out onto your front lawn. Maybe the air smells like Valentine’s Day, maybe it smells like Honda Civics or pine cones or seagulls. Take it in. Jump in the air and feel the quick, soft thud of grass and dirt beneath your feet. Plunge your hands into the soil and look…

For now, try to forget the bummer news that time travel—at least in the sense of moving a particle faster than the speed of light—ain’t ever happening.  Richard Branson’s space tourism company Virgin Galactic is promising a unique consolation prize, on a much more gratifying timeline:…