Kudos to the scientists and engineers with JPL, NASA and everyone involved with the successful Martian landing of InSight and the MarCOs satellites! I'm especially intrigued with the X band refectantenna array used with MarCOs. It's compact during lift-off, but deploys during spaceflight. It acts as a parabolic antenna. The MarCOs are the first cubesats to leave Earth orbit and they performed as planned relaying InSight's telemetry back to Earth during its descent and landing on the Martian surface.