Every year in early January, Earth reaches the closest point in its orbit to the Sun, a moment astronomers call perihelion.

Scientists have pulled back the curtain on one of the most extreme solar regions seen in decades, tracking it almost nonstop ...

The sun’s outer atmosphere resembles a pufferfish.

Earth reaches its closest point to the sun in its 2026 orbit on Jan. 3. The sun will appear larger in the sky than on any ...

For much of the past decade, Andrew McCarthy has been exploring the universe—albeit from his backyard in Arizona. Using telescopes with specialized filters, planetary cameras, and astro-specific ...

Sunburn and heat exhaustion aren’t the only reasons to avoid too much sunshine this summer: Going gray is another consideration. Hair strands, which grow out of glands called follicles, can't change ...

Sun bears are the smallest bear species, measuring 4 to 5 feet long on their hind legs and weighing 60 to 150 pounds. This is only about half the size of an American black bear. Sun bears are named ...