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Why is the Sun's corona so much hotter than the Sun's surface? (more unsolved problems in astronomy) The temperature of the photosphere is approximately 6,000 K, whereas the temperature of the corona reaches 1,000,000–2,000,000 K. The high temperature of the corona shows that it is heated by something other than direct heat conduction from the photosphere. It is thought that the energy ...
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Franklin Delano Roosevelt [a] (January 30, 1882 – April 12, 1945), commonly known by his initials FDR, was an American statesman and politician who served as the 32nd president of the United States from 1933 until his death in 1945. He was a member of the Democratic Party and is the only U.S. president to have served more than two terms.
Arizona is the sixth largest state by area, ranked after New Mexico and before Nevada. Of the state's 113,998 square miles (295,000 km 2 ), approximately 15% is privately owned. The remaining area is public forest and parkland, state trust land and Native American reservations.
t. e. Generation Z (often shortened to Gen Z ), colloquially known as Zoomers, [1] [2] [3] is the demographic cohort succeeding Millennials and preceding Generation Alpha. Researchers and popular media use the mid-to-late 1990s as starting birth years and the early 2010s as ending birth years.
Fibonacci sequence. A tiling with squares whose side lengths are successive Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13 and 21. In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn .