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The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
This list of space telescopes (astronomical space observatories) is grouped by major frequency ranges: gamma ray, x-ray, ultraviolet, visible, infrared, microwave, and radio. Telescopes that work in multiple frequency bands are included in all of the appropriate sections.
The location of IC 2177 (circled in red) IC 2177 is a region of nebulosity that lies along the border between the constellations Monoceros and Canis Major.It is a roughly circular H II region centered on the Be star HD 53367. [5]
Get your telescope ready in September, when Saturn will take center stage in the sky and shine brighter than at any other point in the year. The planet will reach opposition on Sept. 21, around ...
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.
Membrane Space Telescope: A concept of huge reflecting telescopes in space, where the primary mirror would be composed of very thin and lightweight membrane, that would be kept in the required accurate shape by thermal radiative pressure projected from behind. ~15nm RMS precision was achieved in prototype testing. [49]
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