That secondary mirror, in turn, bounced the light (and thus the image seen) into a convex eyepiece lens built into the side of the tube. This was the first working reflecting telescope.

Giant ground-based reflector telescopes do much of astronomy's heavy lifting, although the U.S.'s largest in Hawaii is not ...

Telescope mirrors are sensitive and prone to damage ... you can expect a flawless reflection. And if you happen to have some left over, it can be used to help make your own windshield wiper ...

The journey of astronomical telescopes began in the early 17th century when Galileo Galilei crafted his first refracting ...

New U.S. Postal Service stamps released last week feature images captured by NASA's James Webb Space Telescope.

Dobsonians are based on the reflector telescope design that sees a large primary mirror collect light then reflect it back into a secondary mirror (here's an explainer of the different telescope ...

The NIAOT in Nanjing was placed on Washington’s entity list in 2023, not long after shipping the finished spectrograph.

The Stephens observatory, located on the roof of Carnegie, houses a 12-inch Newtonian reflecting telescope, built by Roscoe G. Stephens of Kennebunk, Maine. Stephens gifted the telescope to the ...

"Seeing" in the infrared will allow the telescope to ... be applied to the 74cm-diameter secondary reflector which sits out in front of the primary mirror and is used to bounce light back towards ...

Over time, astronauts added other instruments to the telescope, but they all had to account for the bad mirror. Even the original “eyeglasses” were eventually replaced with better ones.

The mirrors one sees around the periphery of the dome are historical left-overs from the transition between the long-and-narrow refractor and its replacement short-and-fat reflector. In order to fully ...