The latest space tourism venture depends more on hot air than rocket science. World View Enterprises — the outfit that plans to send a married couple to Mars — has announced plans to send tourists up 19 miles in a capsule, lifted by a high-altitude balloon. Company CEO Jane Poynter said the price for spending a couple of hours looking down at the curve of the Earth will be $75,000. OK, it’s not quite space — space starts at 62 miles — but still. The first launch could be as early as the end of 2016.