Paul M. Sutter is an astrophysicist at The Ohio State University, host of Ask a Spaceman and "Space Radio," and author of "Your Place in the Universe." Sutter contributed this article to Space.com's ...

The Hubble constant is one of the most important numbers in cosmology because it tells us how fast the universe is expanding, which can be used to determine the age of the universe and its history. It ...

Discover how astronomers use stellar parallax to navigate spacecraft in deep space without relying on Earth-based beacons.

Scientists have calculated the average distance between stars, but there's much more to star distribution than meets the eye. When you purchase through links on our site, we may earn an affiliate ...

Look up on a clear night, and you'll see thousands of stars blinking back at you. The trained eye can trace the brightest bodies to find everything from a great hunter to a mythological sea goat, but ...