Most people carry a fairly comfortable picture of the planet they live on: solid ground underfoot, north is north, and ...

Earth is the planet we have the best opportunity to understand in detail—helping us see how other rocky planets behave, even ...

We tend to think of Earth as familiar and predictable. Same sky, same ground, same oceans. But once you start digging into ...

Earth Day started in the 1970s. Here’s an Earth Day fact everyone should know: Earth Day was first observed on April 22, 1970, followed in 1972 by World Environment Day. It has ...

The natural world rarely behaves the way we expect. Physics bends intuition. Biology ignores neat categories. Space refuses to be reasonable. Some facts sound like they were invented for a science ...

The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, colder neighbor.

Select an option below to continue reading this premium story. Already a Honolulu Star-Advertiser subscriber? Log in now to continue reading. Diamonds require even more extreme conditions — carbon ...