“The engine that we have now could have probably taken seven years and up to half a billion dollars,” Stan Rudenko tells me over a video call from Abu Dhabi. “In our collaboration, it basically took half a year . . . and we already have a first version. It’s mind-blowing.” Rudenko is the CEO of Aspire Space Technologies, and the collaboration he’s talking about is with Leap 71, a Dubai-based computational engineering startup founded by the aerospace engineer Josefine Lissner and the entrepreneur