Sun
How South Korea makes the most innovative sunscreen in the world
What is the summer solstice? Here’s what you need to know.
FDA approves first new sunscreen ingredient in more than 20 years
A rare sungrazing comet is about to make an extreme flyby
White rainbows are real—but very rare
Why the equinox ushers in the arrival of spring
Is this Italy's most restorative island escape?
Why so many women are vitamin D deficient
Here's why Earth is closer to the sun on January 3
How to see the northern lights—and why they’re more common now
Inside the colossal quest for limitless energy
Phases of the moon, explained
Surprising ways animals react to solar eclipses
Here's what a solar tornado looks like
What Norway's midnight sun season is like—in pictures
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