The umbra is the dark, inner shadow of Earth. Shaped like a cone, it stretches deep into space. Its circular cross section ...

The York County Astronomical Society will hold a public Starwatch, 8-10 p.m. Saturday at their observatory at John Rudy County Park, 400 Mundis Race Road.

"The gamma-ray burst traveled through intergalactic space at the speed of light for eleven billion years, during which time the Sun and the planets were born." — Timothy Ferris, in the film version of ...

NASA’s Astronomy Picture of the Week showcases stunning images, from the vibrant Butterfly Nebula to the iconic Horsehead ...

The universe tells us its story mainly through light and other wavelengths of electromagnetic radiation. We learn about the planets, stars, and galaxies by their light—visible light, and also ...

The XXVIIIth General Assembly of the International Astronomical Union (IAU) ends today in Beijing, China. One of the largest astronomy meetings ever held, it saw a pot pourri of frontline astronomy ...

Watch the video to take a look back at the Blood Moon, with three more astronomy events to look out for this month.

Eicher takes new role as Astronomy Editor Emeritus, with Senior Editor Mark Zastrow appointed the magazine’s next Editor-in-Chief.

The decommissioning of the telescope has seen the site reverted back to its natural condition. A three-year survey will now watch how wildlife returns to that part of the mountain. When you purchase ...