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 ...

Learning to read and use a star map can transform stargazing into a guided journey among constellations, planets, and deep-sky wonders. With the right preparation, tools, and techniques, you can ...

A compass used by Lewis and Clark on their expedition to explore the American West is owned by the Smithsonian and is part of NPR's 250th anniversary series, America In Pursuit.