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2. List of large optical telescopes - Wikipedia

   en.wikipedia.org/wiki/List_of_large_optical...

   This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time. In 1900 a 1-meter reflector would be among the largest in the world, but by 2000, would be relatively common for professional observatories.

3. List of largest optical reflecting telescopes - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_optical...

   The Steward Observatory Mirror Lab produced the 6.5 metre f/1.25 collimator used in the Large Optical Test and Integration Site of Lockheed Martin, used for vacuum optical testing of other telescopes.

4. Neutron supermirror - Wikipedia

   en.wikipedia.org/wiki/Neutron_supermirror

   values in the range of 1–3 are common, in specific areas for high-divergence (e.g. using focussing optics near the source, choppers, or experimental areas) m=6 is readily available. Nickel has a positive scattering cross section, and titanium has a negative scattering cross section, and in both elements the absorption cross section is small ...

5. Reflecting telescope - Wikipedia

   en.wikipedia.org/wiki/Reflecting_telescope

   A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic ...

6. Polar vortex headed for US will bring ‘exceptionally cold ...

   www.aol.com/news/polar-vortex-headed-us-bring...

   Polar vortex headed for US will bring ‘exceptionally cold’ temps in the new year: ‘Weather models are screaming’

7. Man Attacked, Needed 14 Staples in His Head After 2 Men ... - AOL

   www.aol.com/man-attacked-needed-14-staples...

   A man in Georgia has been attacked after two men posing as Amazon workers forced their way into his home, it's been reported. On Saturday, Jan. 11 at around 8 a.m. local time, the two people, who ...

8. Greenland is not for sale, its leader says in response to Trump

   www.aol.com/news/greenland-not-sale-leader-says...

   COPENHAGEN (Reuters) -Greenland is not for sale, its elected leader said on Monday, responding to comments made by U.S. President-elect Donald Trump regarding the "ownership and control" of the ...

9. Newtonian telescope - Wikipedia

   en.wikipedia.org/wiki/Newtonian_telescope

   Newtonian telescope design. A Newtonian telescope is composed of a primary mirror or objective, usually parabolic in shape, and a smaller flat secondary mirror.The primary mirror makes it possible to collect light from the pointed region of the sky, while the secondary mirror redirects the light out of the optical axis at a right angle so it can be viewed with an eyepiece.