Add Yahoo as a preferred source to see more of our stories on Google. Last week, the Trump administration released a presidential budget request that would cancel almost all NASA science missions in ...

There are substantial technical, political, and financial obstacles to starting the colonization of Mars within the next few decades. SpaceX is farther along than most toward this ambitious goal.

For years, popular culture has treated a human settlement on Mars as an almost inevitable next chapter, a matter of engineering and willpower rather than fundamental limits. Astrophysicist Neil ...