In terms of scope, the accords relate to activities in orbit, on the surface, and in the subsurface of the moon, Mars, comets ...

U.S. plans to return Mars samples face delays as China advances its own mission. Scientists and policymakers debate costs, timelines, and the role of sample return in future Mars exploration ...

For astronaut safety and to bolster success of the human exploration to come later, NASA needs an end-to-end demonstration of traveling to Mars, doing something scientifically useful, and returning ...