NASA technical staff are on a roll, cloud-wise. The agency developed its own cloud, in the shape of Nebula. It contributed key pieces to the nascent OpenStack effort, and former CTO Chris Kemp recently reappeared with a startup also (confusingly!) called Nebula. Josh McKenty, another NASA cloud alum, today launched Piston Cloud. The company’s enterprise-ready secure cloud operating system, pentOS, is based upon hardened OpenStack code and a stripped-down Linux distribution, and is intended to give enterprise customers security and flexibility in assembling their cloud infrastructure.