Its reflecting telescope and 2.4 meter mirror are fine, but not its computer hardware. Shortly after 4 p.m. EDT on Sunday, June 13, Hubble’s payload computer stopped working.

Choosing the best telescope for the money depends to a large extent on what you hope to see. If you want to scan distant nebulas, you can pay $1,000 and up, and it will still be good value. If you ...

Construction plans for the largest telescope on Earth remain uncertain, but a possible alternative future for the Thirty Meter Telescope project is beginning to take shape. Plans for the massive ...

A University of Iowa researcher has won a NASA award to design and prototype a smaller, more efficient X-ray telescope to aid ...

If a telescope is on your shopping list, considering a few things will help ensure it provides years of discovery instead of an expensive place to hang clothes.

Mirrors, on the other hand, have just one side that needs shaping. Therefore, it's much cheaper to manufacture a reflecting telescope than a refracting telescope of the same size.

1845 In Ireland, William Parsons builds the Leviathan, a reflecting telescope with a mirror that is 6 feet in diameter. He uses it to discover the spiral structure of the nebula M51. 1908 The Hale ...

What causes the diffraction spikes in images from the James Webb Space Telescope (JWST)—and how to tell them apart from images from the Hubble Space Telescope (HST).

Advances in technology over the last 20 years are giving birth to a new generation of telescopes that will open up the skies.

The same bare-bones 6-inch f/8 Dobsonian-mounted reflector telescope that’s appropriate for the beginner will also satisfy your needs.

Newton's reflecting telescope consisted of a single curved main mirror, coupled with a smaller flat mirror positioned at the focal point and aimed at 45 degrees.