Plus: President-elect Donald Trump says he will rename the country's tallest mountain, reverting to a former name. | The year in space exploration.

For example, he has rarely criticized NASA or its overall goal to return humans to the Moon through the Artemis Program. Rather, Musk, who has long preferred Mars as a destination for humans, has more ...

NASA wants to Mars samples to Earth, but budget problems and technical woes have the mission caught between a rock and the ...