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Amarillo (/ ˌ æ m ə ˈ r ɪ l oʊ / [6] AM-ə-RIL-oh; Spanish for "yellow") is a city in the U.S. state of Texas and the seat of Potter County.It is the 14th-most populous city in Texas and the most populous city in the Texas panhandle. [7]
The Yerkes spectral classification, also called the MK, or Morgan-Keenan (alternatively referred to as the MKK, or Morgan-Keenan-Kellman) [17] [18] system from the authors' initials, is a system of stellar spectral classification introduced in 1943 by William Wilson Morgan, Philip C. Keenan, and Edith Kellman from Yerkes Observatory. [19]
Chicago [a] is the most populous city in the U.S. state of Illinois and in the Midwestern United States.With a population of 2,746,388, as of the 2020 census, [9] it is the third-most populous city in the United States after New York City and Los Angeles.