An aperture mask is a simple device for easier observing that increases the effective focal ratio of a telescope.

An amateur astrophotographer has captured a stunningly detailed view of the spiral galaxy Messier 106, which is located 24 ...

Your Artstor image groups were copied to Workspace. The Artstor website will be retired on Aug 1st. Proceedings of the Royal Irish Academy (... Proceedings of the Royal Irish Academy (1836-1869) ...

Thankfully, there are lots of entry-level telescopes on the market ... His instrument is a Celestron NexStar, a Schmidt-Cassegrain reflector with a 150-mm aperture, has a motorized altitude ...

Under Trump’s proposal, NASA’s budget would be cut by $6 billion in what the nonprofit Planetary Society says is the biggest ...

After testing it out, we think it's one of the best telescopes on the market, if not the best. Schmidt-Cassegrain telescopes are known for their impressive optical quality, and the Celestron ...