In half a lifetime, Jonny Kim has achieved the American dream three times over. He was a Navy SEAL. Then he graduated from Harvard Medical School. And on Tuesday, he blasted off as part of his ...

WASHINGTON — The nominee for NASA’s top job, billionaire spacewalker Jared Isaacman, outlined his vision for space exploration on Wednesday that prioritizes sending astronauts to Mars.

WASHINGTON — The nominee for NASA’s top job, billionaire spacewalker Jared Isaacman, outlined his vision for space exploration on Wednesday that prioritizes sending astronauts to Mars.