Nearly 400 years ago, Galileo looked at the Pleiades star cluster through his telescope and noticed that the seven or so ...

A map centered at the estimated source region for potential plumes from Europa. NASA/JPL-Caltech/SETI Institute Downloads ...

John R. Casani, a longtime Jet Propulsion Laboratory engineer, project manager and researcher, died at the age of 92 last ...

Vatican Observatory Summer School welcomes students from 21 nations to explore the universe with JWST, igniting passion for ...

Highlighting 10 major astronomical milestones of the past century in celebration of the Royal Greenwich Observatory’s 350th ...

In the early 1600s, Dutch spectacle maker Jan Lippershey discovered that combining lenses could magnify distant objects.

Text and photos by Michael J. Meyer Anyone who has visited Ocracoke Island knows how special it is: from stunning sunsets to magnificent views of the Milky Way on a moonless night after a cold ...

Astronomy Vatican erects its largest telescope in the U.S. to monitor Galileo’s dream. The Catholic Church has almost always been at the forefront of astronomical research and its facilities in ...

On this date, Jan. 7, 1610, astronomer Galileo Galilei, with a homemade telescope, noticed three points of light near Jupiter. Initially believing they were distant stars, Galileo’s repeated ...

German astronomer Simon Marius is best remembered for his disputes with Galileo Galilei over priority for discovering Jupiter’s four major moons. This, despite the fact that Marius definitely ...

A Galilean telescope is, in essence, a tube with two lenses placed at either end. The eyepiece is a plano-concave lens, which is flat on one side and curved inward on the other.