It's his first headlining tour in nearly a decade.

This will occur Friday, and everyone in the world can watch, weather permitting. Earth and Mars align with the sun in opposition about once every two years. But truly jaw-dropping midnight views of ...

The new moon on Aug. 23 at 2:06 a.m. EDT (0606 UTC) is also a black moon, defined as the third new moon in a season that will see four new moons. Three days later, the moon will make a close pass to ...

As an astronomer studying the universe beyond Earth, I’m fond of “outside the box” views almost by default. But one of my favorites is whenever a spacecraft takes a snapshot of our home world and the ...