We like to think of our home as a nice, smooth sphere. But mapping the Earth’s gravitational field provides a different view of the planet. a new visualization of Earth looks nothing like the Blue ...

The Sun may carry chemical and structural traces of a large rocky planet that disappeared early in the solar system’s history ...

During the Cold War, U.S. and international monitoring agencies could detect nuclear tests and measure their size. Today, they seek to pinpoint much smaller explosives tests. Under the sponsorship of ...

This hands-on, guided-inquiry activity helps students to understand the geometry of lunar and solar eclipses by creating a physical, proportional model of the Earth and Moon system and observing ...

Earth supports a breathtaking range of geographies, ecosystems and environments, each of which harbors an equally impressive array of weather patterns and events. Climate is an aggregate of all these ...

Understanding Earth’s composition first requires an explanation of how planets form — a process that begins with a giant gaseous disk surrounding a star. Although Earth’s atmosphere is now just a thin ...