Asteroids matter in mining discussions because they contain water, metals, and clues about space resource economics.

Long-period comets are difficult to forecast because tiny forces can change their paths over thousands of years.

Learn how to find comet viewing dates using reliable astronomy sources, orbit tools, and observation tips for better skywatching.

Comets may have delivered some of Earth’s water, but new isotopic evidence shows the story is more complex and likely mixed with asteroid contributions.

Astronaut hair care in microgravity uses water, no-rinse shampoo, and careful cleanup to protect equipment and skin.

Explore why Halley’s Comet is famous, from its 76-year orbit and historic sightings to its role in astronomy and culture.

Learn why astronauts lose muscle in space, which muscles are affected most, and how NASA reduces muscle loss on long missions.

A spacecraft impact can change an asteroid’s path, reveal its internal structure, and test planetary defense methods in real missions.