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Curvy spaceplane is one step closer to its ISS rendezvous

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Sierra Space’s Dream Chaser spaceplane recently demonstrated the ability to handle critical payloads destined for the International Space Station .

The retro-futuristic spaceplane is based on the HL-20 Personnel Launch System , a spaceplane concept first developed by NASA in the 1980s .

Dream Chaser's first official ISS mission is scheduled to launch no earlier than May .