Depends on how specific we are talking about. The inner core of the earth is approximately 5000 degrees celsius, or 9032 Fahrenheit, Itâs the hottest area in the earth. The outer core is 5000 - 3700 degrees Celsius, or 9032 - 6692 Fahrenheit, Itâs very hot magma, and the second hottest part of the earth. The Inner mantle is about 3700 - 1600 Degrees Celsius, or 6692 - 2912 Fahrenheit, Itâs the third hottest.
Where is the largest optical telescope in the world? The largest optical telescopes in the world are the W. M. Keck telescopes on top of the dormant volcano Mauna Kea in Hawaii. At an elevation of 13,800 feet, the Keck telescopes are above much of the cloud cover. The two Keck telescopes each have a diameter of 33 feet!
Hale's vision for large telescopes and Palomar Observatory Astronomer George Ellery Hale, whose vision created the Palomar Observatory, built the world's largest telescope four times. He published an article in the April 1928 issue of Harper's Magazine called The Possibilities of Large Telescopes.