Reusable rocket technology has been a 'holy grail' of sorts for space exploration. Building reusable components is supposed to make space travel more affordable, but the Space Shuttle
is the prime example of how that's not necessarily true, as it cost over an order of magnitude more than originally planned. Still, it should be possible to make reusable rockets that are cheaper to operate, and some private companies are figuring out how to do it. SpaceX hasn't quite gotten reusable rockets perfected yet (though, it has done it more than a few times with its Grasshopper vehicle
). And depending on how you define a "rocket" -- Virgin Galactic & Scaled Composites have also developed reusable space vehicles.
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