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Dream Chaser
The Dream Chaser is an American reusable crewed suborbital and orbital〔 lifting-body spaceplane being developed by Sierra Nevada Corporation (SNC) Space Systems. The Dream Chaser is designed to carry up to seven people to and from low Earth orbit. The vehicle would launch vertically on an Atlas V rocket and land horizontally automatically on conventional runways.〔
== Design ==
Dream Chaser is a reusable composite spacecraft designed to carry from two to seven people and/or cargo to orbital destinations such as the International Space Station.〔 It would have a built-in launch escape system〔
and could fly autonomously if needed.〔
It could use any suitable launch vehicle but is planned to be launched on a human-rated Atlas V 412 rocket.〔〔 The vehicle would be able to return from space by gliding (typically experiencing less than 1.5 g on re-entry) and landing on any airport runway that handles commercial air traffic.〔〔 Its reaction control system thrusters burn ethanol-based fuel,〔〔 which is not an explosively volatile material, allowing the Dream Chaser to be handled immediately after landing, unlike the Space Shuttle.〔 Its thermal protection system (TPS) is an ablative tile created by NASA's Ames Research Center that would be replaced as a large group rather than tile by tile, and would only need to be replaced after several flights.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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