X-37B is off on its fourth flight!

The USAF did not disclose which of their two vehicles is making this flight (OTV-4), but presumably it’s the the one that did not fly on the last one, which means both of the vehicles will now have demonstrated reusability.  Payloads include a USAF ion drive experiment and a NASA materials science experiment.  There’s also a CubeSat riding shotgun on the Atlas V for the Planetary Society, carrying a solar sail experiment.

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