From 2018 to 2020, Astra was a contender in the DARPA Launch Challenge; first, as considered one of a few groups, although at this point Astra held its involvement key and was only generally known as "stealth startup" with the Obstacle organizers. Then as one other two groups dropped out, https://bookmarksparkle.com/story16633952/astra-toto-things-to-know-before-you-buy