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  2. Celestron - Wikipedia

    en.wikipedia.org/wiki/Celestron

    Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...

  3. Looking to pick up a new hobby? Celestron telescopes are at ...

    www.aol.com/news/looking-pick-hobby-celestron...

    BEST TELESCOPE DEAL FOR BEGINNERS: Those who are taking baby steps in the astronomy world will benefit from the Celestron AstroMaster 70AZ Telescope — $125.99 $185.95 (Save $59.96)BEST COMPACT ...

  4. Unusual eBay listings - Wikipedia

    en.wikipedia.org/wiki/Unusual_eBay_listings

    Bridgeville, California (population 25) was the first town to be sold on eBay in 2002, and has been up for sale three times since. [1] In January 2003, Thatch Cay, the last privately held and undeveloped U.S. Virgin Island, was listed for auction by Idealight International. The minimum bid was US$3 million and the sale closed January 16, 2003. [2]

  5. Schmidt camera - Wikipedia

    en.wikipedia.org/wiki/Schmidt_camera

    The spherical mirror used in this telescope was extremely accurate; if scaled up to the size of the Atlantic Ocean, bumps on its surface would be about 10 cm high. [ 16 ] The Kepler photometer , mounted on NASA's Kepler space telescope (2009–2018), is the largest Schmidt camera launched into space.

  6. List of radio telescopes - Wikipedia

    en.wikipedia.org/wiki/List_of_radio_telescopes

    Four of the sixty-four total antennas of the ALMA radio telescope, at the Atacama Large Millimeter Array (ALMA) West arm of the low-frequency Ukrainian T-shaped Radio telescope, second modification (UTR-2) radio telescope phased array antenna. This is a list of radio telescopes – over one hundred – that are or have been used for radio ...

  7. List of largest optical reflecting telescopes - Wikipedia

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

    Multiple mirror telescopes that are on the same mount and can form a single combined image are ranked by their equivalent aperture. Fixed altitude telescopes (e.g. HET) are also ranked by their equivalent aperture. All telescopes with an effective aperture of at least 3.00 metres (118 in) at visible or near-infrared wavelengths are included.

  8. US retailers aim to cash in on Cyber Monday with steep online ...

    www.aol.com/news/us-retailers-aim-cash-cyber...

    For instance, Target said it was offering 50% off thousands of items including video games, home decor and other technology items with a "two-day Cyber Monday" sale that started on Sunday.

  9. List of large optical telescopes - Wikipedia

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

    This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes. This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.

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