Obviously most telescopes need to see the sky to do their job, but when you are studying a wave that can pass right through the earth, the best place for your telescope might be underground.
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Sources:
http://www.et-gravitational wave.eu/
https://www.ligo.caltech.edu/page/what-is-interferometer
https://www.nature.com/articles/d41586-018-07867-z
http://www.et-gravitational wave.eu/index.php/etdsdocument
https://gravitational wavecenter.icrr.u-tokyo.ac.jp/en/archives/1075
https://www.nobelprize.org/prizes/physics/2015/advanced-information/
https://www.birmingham.ac.uk/news/latest/2019/05/Two-University-academics-awarded-the-prestigious-royal-society-wolfson-fellowship.aspx
https://www.elisascience.org/articles/lisa-mission/first-gravitational-wave-observatory-space/mission-concept
https://www.nature.com/articles/d41586-018-04157-6
https://www.ligo.org/science/Publication-O1StochNonGR/index.php
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Images:
https://www.istockphoto.com/vector/big-set-of-solar-system-space-shuttle-illustration-and-astronomy-observatory-the-gm877959764-244905897
https://svs.gsfc.nasa.gov/12740
https://www.ligo.caltech.edu/image/ligo20150731f
https://www.ligo.caltech.edu/image/ligo20150731a
https://www.ligo.caltech.edu/image/ligo20170927b
https://commons.wikimedia.org/wiki/File:In-construction_KAGRA_gravitational-wave_detector.jpg
https://images.nasa.gov/details-GSFC_20171208_Archive_e000415.html
https://www.spacetelescope.org/videos/hubblecast64b/
https://svs.gsfc.nasa.gov/11086
https://www.ligo.caltech.edu/image/ligo20170927e
https://commons.wikimedia.org/wiki/File:CMB_Timeline300_no_WMAP.jpg
https://svs.gsfc.nasa.gov/12656
https://www.istockphoto.com/photo/multi-country-travel-receipts-from-europe-gm909207524-250433673
https://www.istockphoto.com/photo/blank-note-gm175399708-20053728
https://www.istockphoto.com/photo/old-wallet-gm173025556-7370809
https://www.istockphoto.com/photo/mini-ticket-gm174783280-22058205
https://www.istockphoto.com/photo/overflowing-briefcase-gm117591761-8122947
https://www.istockphoto.com/photo/blank-red-admission-ticket-gm116571815-5572341
https://www.istockphoto.com/photo/wierzchowska-gorna-cave-with-stalactites-and-stalagmites-in-wierzchowie-poland-gm157721344-7758717
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