At more than one million degrees, the sun's atmosphere—the corona—is incredibly hot; but not everywhere. Time and again, huge ...

Many objects in space rotate. Earth completes a spin in roughly 24 hours, while Venus takes a whopping 243 Earth days. The moon's rotational period is about 27 days. The sun, it turns out, also ...

Discover interesting facts about the sun, the solar system's central star that supports all life on Earth. When you purchase through links on our site, we may earn an affiliate commission. Here’s how ...

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For observers on Earth, the sun appears as a bright, familiar disk—but what we see is only half the story. Like the moon, one ...

Facing down a heat wave this summer? There's a new beta app for iPhones from the founder of Twitter, Jack Dorsey, that helps you track your exposure to the sun. The Sun Day app is free to testers and ...