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Things You Didn't Know About the Sun  
JUST THE FACTS 

Tags: sun, solar flares, sun facts, solar system

Even though it's our biggest source of light, heat, and energy, there are a whole lot of things we don't know about the sun. Here are some interesting facts that you might not have known.

	One day on the sun is 609 hours and 7 minutes.
	The gravity on the sun is 28 times what it is on Earth.
	Hydrogen and helium are the dominant gases in the sun.
	109 Earths could fit on the sun's surface and more than a million could fit inside it.
	There are three parts to the sun's atmosphere: the photosphere, the chromosphere, and the solar corona.
	Solar winds blow at about 280 miles per second through the solar system.
	The sun has used half the hydrogen in its core, meaning it has roughly 5 billion years left before its sole source of energy is helium, which will cause it to expand 100 times and absorb the nearest planets.
	The brightness of the sun fluctuates a few tenths of a percent over time.
	The inside of the sun (or underneath the layer we can see from Earth) is completely dark.
	It takes 8 minutes for light from the sun to travel to Earth.
	The sun orbits around the center of the Milky Way at 800,000 kilometers per hour; it takes 225,000,000 years to orbit once.

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