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!
The visible spectrum of light includes all of the colors that can be detected by the human eye, and it only makes up a very small portion of the total electromagnetic spectrum, about 400nm to 700nm. Optical telescopes use polished mirrors or glass lenses to focus visible light as it comes in through the aperture. There are two main types of optical telescopes, reflectors and refractors. Reflecting telescopes tend to be much larger and use parabolic mirrors to focus light. Refracting telescopes use lenses to bend light as it passes throught them. These are limited by the size of the lenses, and therefore tend to be much smaller than reflectors. Radio telescopes are used to study much longer wavelengths than visible light. Often, radio telescopes use a dish to focus the radio waves onto the receiver. The receiver then sends the signal to be recorded for astronomers to study.