The Trump administration aims to accelerate the construction of a nuclear reactor on the moon, Transportation Secretary and acting NASA Administrator Sean Duffy wrote in a memo distributed internally on Monday. The space agency has previously explored the possibility of installing an electricity-generating nuclear reactor on the lunar surface capable of powering a sustained human presence, but Duffy intends to fast-track the project and more than double the reactor’s power output, according to documents obtained by The Post. “To properly advance this critical technology to be able to support a future lunar economy, high power energy generation on Mars, and...