The X-38—had it gone operational—would not have been the first reusable spacecraft. But it helped lay the groundwork for future space programs’ emphasis on reusability.

In the latest impact risk assessments from NASA, the agency predicted that there was a 1 in 38 chance, or 2.6 percent, that the YR4 asteroid would hit the Earth. Last week, The European Space ...

THE odds of a massive asteroid slamming into Earth have jumped again, with NASA now warning of a 2.6% ... probability from 2.2% to 2.6%—a 1-in-38 chance. That's just shy of the highest-ever ...