Space-based solar power getting key test aboard US military's mysterious X-37B space plane

A U.S. military space plane is being used to flight-validate the best ways to gather the sun's energy for power beaming from Earth orbit.

In mid-March, the latest classified mission of the U.S. Space Force's X-37B robotic space plane winged past 300 days in Earth orbit.

Most of the robotic space drone's duties on this mission, known as Orbital Test Vehicle-6 (OTV-6), are a tightly held secret. However, one known bit of research that the craft carries is the Photovoltaic Radio-frequency Antenna Module Flight Experiment, or PRAM-FX.