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  2. Black hole - Wikipedia

    en.wikipedia.org/wiki/Black_hole

    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 ...

  3. O. Henry - Wikipedia

    en.wikipedia.org/wiki/O._Henry

    William Sydney Porter (September 11, 1862 – June 5, 1910), better known by his pen name O. Henry, was an American writer known primarily for his short stories, though he also wrote poetry and non-fiction.

  4. Gastrointestinal tract - Wikipedia

    en.wikipedia.org/wiki/Gastrointestinal_tract

    The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the digestive system that leads from the mouth to the anus.The GI tract contains all the major organs of the digestive system, in humans and other animals, including the esophagus, stomach, and intestines.

  5. Andromeda Galaxy - Wikipedia

    en.wikipedia.org/wiki/Andromeda_Galaxy

    The Andromeda Galaxy in high-energy X-ray and ultraviolet light (released 5 January 2016) Apparently, by late 1968, no X-rays had been detected from the Andromeda Galaxy. [ 111 ] A balloon flight on 20 October 1970 set an upper limit for detectable hard X-rays from the Andromeda Galaxy. [ 112 ]

  6. Ultra high frequency - Wikipedia

    en.wikipedia.org/wiki/Ultra_high_frequency

    Ultra high frequency (UHF) is the ITU designation [1] for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter).

  7. Polyethylene glycol - Wikipedia

    en.wikipedia.org/wiki/Polyethylene_glycol

    Polyethylene glycol (PEG; / ˌ p ɒ l i ˈ ɛ θ əl ˌ iː n ˈ ɡ l aɪ ˌ k ɒ l,-ˈ ɛ θ ɪ l-,-ˌ k ɔː l /) is a polyether compound derived from petroleum with many applications, from industrial manufacturing to medicine.

  8. Tooth decay - Wikipedia

    en.wikipedia.org/wiki/Tooth_decay

    Dental cavity, also known as tooth decay, [a] is the breakdown of teeth due to acids produced by bacteria. [6] The resulting cavities may be a number of different colors, from yellow to black. [1]