October 9, 2018, 10:21 a.m.
Here's a look at some of the beautiful, bold and essentially unexplained moons of our solar system.
October 8, 2018, 11:13 a.m.
Obama designated more national monuments than any other president in U.S. history. Here are a few reminders why each one is worth protecting.
October 4, 2018, 10:55 a.m.
Ossuaries were created as reminders of mortality or solutions for cemetery crowding. Now, some are tourist attractions.
October 1, 2018, 9:23 a.m.
These birds are special for their impressive journeys, despite their endangered status.
September 28, 2018, 9:10 a.m.
Some breeds are known for their speed or their looks, while others are lauded for their brilliance.
September 27, 2018, 12:19 p.m.
Here's a look at the species that were declared extinct in the last decade — and a few that scientists say may also have gone the way of the dodo during the 21st century.
September 6, 2018, 11:57 a.m.
NASA's Cassini orbiter reveals stunning pictures of the planet and its rings.
September 5, 2018, 11:04 a.m.
Can lost species ever become un-extinct? Many scientists believe it's only a matter of time before many extinct animals again walk the Earth through cloning.
August 8, 2018, 11:17 a.m.
Few natural wonders encapsulate the sublimity, power and impermanence of the wild better than roaring waterfalls.