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1983 (7th Session) Area. 38,160.87 ha. Machu Picchu is a 15th-century Inca citadel located in the Eastern Cordillera of southern Peru on a 2,430-meter (7,970 ft) mountain ridge. [2] [3] Often referred to as the "Lost City of the Incas", it is the most familiar icon of the Inca Empire. It is located in the Machupicchu District within Urubamba ...
A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force. Photons are massless particles that always move at the speed of light ...
Fish bone pierced in the upper esophagus. Right image without contrast medium, left image during swallowing with contrast medium. To obtain an image with any type of image detector the part of the patient to be X-rayed is placed between the X-ray source and the image receptor to produce a shadow of the internal structure of that particular part of the body.
Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...
A Chandra X-Ray Observatory image of Cygnus X-1, which was the first strong black hole candidate discovered. X-ray binaries are binary star systems that emit a majority of their radiation in the X-ray part of the spectrum. These X-ray emissions are generally thought to result when one of the stars (compact object) accretes matter from another ...
The Mikoyan-Gurevich MiG-21 ( Russian: Микоян и Гуревич МиГ-21; NATO reporting name: Fishbed) is a supersonic jet fighter and interceptor aircraft, designed by the Mikoyan-Gurevich Design Bureau in the Soviet Union. Its nicknames include: " Balalaika ", because its planform resembles the stringed musical instrument of the same ...
The Roswell incident is a conspiracy theory which alleges that the 1947 crash of a United States Army Air Forces balloon near Roswell, New Mexico was actually caused by an extraterrestrial spacecraft. Operated from the nearby Alamogordo Army Air Field and part of the top secret Project Mogul, the balloon was intended to detect Soviet nuclear ...
X-Ray Spex was an English punk rock band formed in 1976 in London. During their first incarnation (1976–1979), X-Ray Spex released five singles and one album. [1] Their 1977 single " Oh Bondage Up Yours! " and 1978 debut album Germfree Adolescents are widely acclaimed as classic punk releases.