Proponents of going to Mars see peril and opportunity in Elon Musk's close relationship with Trump. Experts say just getting Americans back to the moon in the near future will be challenging enough.

NASA has released stunning images of mysterious colorful clouds drifting in the sky over Mars. Captured by NASA's Curiosity ...

Curiosity, a set of NASA 's robotic "eyes" on the Red Planet, recorded 16 minutes of so-called noctilucent clouds flying ...