| From 93 million miles away, it can be easy to forget just how big the sun is. With a diameter of 864,938 miles and a circumference of about 2,715,396 miles, the brilliant ball of hydrogen and helium at the center of our solar system is large enough to fit about 1 million Earths inside of it. It's also some 10,000 degrees Fahrenheit on the surface and, thanks to nuclear reactions, 27 million degrees in its core, producing the same amount of energy every second as 100 billion tons of dynamite. Don't let that give you earthlings an inferiority complex, however — in about 5 billion years, the sun will run out of hydrogen, and eventually collapse into a white dwarf roughly the same size as the Earth. (Earth won't survive that, but luckily we don't need to worry about it for quite some time.) In the meantime, the sun will remain almost unfathomably larger than anything orbiting it — about 1,000 Jupiters could fit inside it, for instance, as could 64.3 million of Earth's moons. | 
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