https://padlet.com/aborghetti/ax3vj8o7nhan By Andrea Borghetti en-us 2017-02-16 20:18:22 UTC 2025-10-28 17:03:15 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Rocket.png aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154456723 The Arecibo observatory is a radio telescope in Arecibo, Puerto Rico. The observatory is the sole facility of the National Astronomy and Ionosphere Center, which refers to the observatory, and the staff that operates it. From its construction in the 1960s until 2011, the observatory was managed by Cornell University.]]> 2017-02-16 20:24:14 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154456723 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154457424 The observatory's 1,000-foot (305-meters) radio telescope was the largest single-aperture telescope from its completion in 1963 until July 2016 when the Five hundred meters aperture spherical telescope was completed. It is used in three major areas of research: radio astronomy, atmospheric science, and radar astronomy. Scientists who want to use the observatory submit proposals that are evaluated by an independent scientific board.]]> 2017-02-16 20:27:09 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154457424 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154458456 2017-02-16 20:31:29 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154458456 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154458694 The reflector is a spherical reflector, not a parabolic reflector. To aim the device, the receiver is moved to intercept signals reflected from different directions by the spherical dish surface of 270 m (870 ft) radius. A parabolic mirror would have varying astigmatism when the receiver is off the focal point, but the error of a spherical mirror is uniform in every direction.]]> 2017-02-16 20:32:35 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154458694 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154459411 2017-02-16 20:35:40 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154459411 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154459798 2017-02-16 20:37:09 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154459798 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154460211 2017-02-16 20:38:50 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154460211 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154460443 2017-02-16 20:39:40 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154460443 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154460812 In 1974, the Arecibo Message, an attempt to communicate with potential extraterrestrial fife, was transmitted from the radio telescope toward the globular cluster Messier 13, about 25,000 light-years away. The 1,679 bit pattern of 1s and 0s defined a 23 by 73 pixel bitmap image that included numbers, stick figures, chemical formulas and a crude image of the telescope.]]> 2017-02-16 20:41:00 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154460812 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154461727 2017-02-16 20:44:21 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154461727 aborghetti https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154462534 2017-02-16 20:47:35 UTC https://padlet.com/aborghetti/ax3vj8o7nhan/wish/154462534