Four small satellites rode a Rocket Lab Electron launch vehicle into orbit from Virginia early Thursday, beginning a government-funded technology demonstration mission to test the performance of a new spacecraft design.

The satellites were nestled inside a cylindrical dispenser on top of the 59-foot-tall (18-meter) Electron rocket when it lifted off from NASA’s Wallops Flight Facility at 12:03 am EST (05:03 UTC). A little more than an hour later, the rocket’s upper stage released the satellites one at a time at an altitude of about 340 miles (550 kilometers).

The launch was the starting gun for a proof-of-concept mission to test the viability of a new kind of satellite called DiskSats. These satellites were designed by the Aerospace Corporation, a nonprofit federally funded research and development center. The project is jointly financed by NASA and the US Space Force, which paid for DiskSat’s development and launch, respectively.

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