The SpaceX Polaris Dawn mission, a daring multiday orbital expedition that will feature the first-ever spacewalk by private citizens, is targeting liftoff early Tuesday, though weather could play spoilsport. A four-member crew, led by Shift4 Payments CEO Jared Iscaacman, is also aiming to fly deeper into space than any other manned mission in more … Continue reading SpaceX Polaris Dawn mission aiming for history with first private spacewalk