At their closest, Mars and Regulus sit just 0.7 degrees apart. That’s about a little finger’s width at arm’s length. It's one ...

Chandra spotted a 300,000-light-year jet from a distant quasar. But amid this breakthrough, the telescope now faces defunding, threatening the future of U.S. X-ray astronomy.

Inflation and budget issues are threatening to hobble NASA’s most in-demand telescopes.