Interesting and Cool Things to Know

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The surface temperature of the Sun is about 5500°C. What do you think the core temperature is?
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What is the average diameter of the Sun?
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The total mass carried away from the Sun by the solar wind is huge. Thus, the Sun loses in 150 million years a mass equal to our entire planet.
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The Sun is gradually getting hotter and brighter. In about 1.1 billion years from now, our star will become 11% brighter. Life on Earth under such conditions can only survive in the depths of the oceans at best.
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We call Mars the "Red Planet", but its sunsets are actually bluish, whereas sunsets on our blue planet Earth look red.
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