Blue Origin engineer Tim Ellis and SpaceX engineer Jordan Noone launched a space start-up together at the end of 2015. The two aerospace techies have a lot of brains between them, but they needed capital for lift off.

"We actually raised our seed round from Mark Cuban — which was a cold email — a week after we said we are starting the company," says Ellis, speaking at the CB Insights A-ha Conference in December. Video of the session was published Wednesday.