NASA space transportation managers are casting a wide net to find exotic new ways to power spacecraft, sponsoring research into concepts that could one day make trips to Mars as simple as a drive down the block and bring interstellar travel into the realm of the possible. Work in the agency's Space Transportation Research (STR) program ranges from relatively well-understood concepts like pulsed-detonation rocket engines to mind-boggling ideas like gravity modification. The idea is to ...

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