Another billionaire-backed space launch charges into the sky tomorrow. Elon Musk’s SpaceX is sending its first all-civilian crew on a three-day mission around the Earth multiple times. Inspiration4 will orbit 360 miles above Earth, higher than the International Space Station, with no professional astronaut on board.. SpaceX’s first private flight will be led by a 38-year-old entrepreneur who’s taking two sweepstakes winners with him on the three-day, round-the-world trip, along with a health care worker who survived childhood cancer. There’s a five-hour targeted launch window that opens at 8 p.m. ET tomorrow (Wednesday).