An international team of astronomers has discovered one of the most extreme instances of magnification by gravitational lensing. Using the Hubble Space Telescope to survey a sample of huge clusters of ...

The magnification (or power) you will see through a given optical system depends on the telescope and the eyepiece. The simple formula is: Magnification = Focal length of telescope ÷ focal length of ...

A common misconception about telescopes is that their primary purpose is to increase the apparent size of distant objects. While magnifying is a key feature of telescopes, it’s not necessarily the ...

This diagram shows the various parts of the Sentinel Space Telescope, an asteroid-monitoring observatory planned by the B612 Foundation. Nearly 9,000 near-Earth asteroids are known today, and more ...

Source: NOVA: "Galileo's Battle for the Heavens" This resource was adapted from NOVA: "Galileo's Battle for the Heavens." As early as the 1300s, eyeglasses made from convex, or outward-curving, lenses ...