This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of ...

Read a sci-fi short story every month and join a virtual community of fellow science fiction fans! NASA has given its ...

Why do some places wait 1,000 years to see a total solar eclipse while others get two in a decade? The surprising orbital mechanics behind where eclipses happen — and don't.

If launched in 2035, a spacecraft performing such a maneuver could fly by 3I/ATLAS by 2085. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

The second of two SpaceX Falcon 9 rockets launched on Saturday (Feb. 21) completed a record-breaking 33rd re-flight. SpaceX launched two more batches of Starlink satellites on Saturday (Feb. 21), and ...