How hot is the Sun, its surface and core? How long does it take the Sun's rays to reach the Earth?
The continuous fusion of hydrogen into helium keeps the core of the Sun cooking at 27,000,000 degrees Fahrenheit. The surface of the Sun, also known as the photosphere, is relatively cool, only 10,000 degrees Fahrenheit.
This fusion process, which is the same thermonuclear process that lies at the heart of the hydrogen bomb, produces the Sun's light we see here on Earth. This sunlight travels the speed of light which is 186,282 miles per second or 299,792,458 meters per second. This means the light from the Sun takes 8.4 minutes to travel 93 million miles to Earth. If the world's fastest land animal were to travel that same distance, it would take a cheetah over 151 years to reach the Earth running about 70 mph nonstop!
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