The Apophis asteroid, once feared to hit Earth, is less than three years from making an unprecedented approach toward Earth. Here's what to know.

Earth Day began as a protest in 1970, but its meaning has evolved. Here’s how it changed - and what it represents today.

Earth Day is celebrated one each spring to promote environmental protection and awareness. Celebrating its 56th year, this year's Earth Day theme, "Our Power, Our Planet," calls for people worldwide ...

Nature in the Neighborhood On Dec. 24, 1968, Apollo 8 astronaut William Anders took a photo that photographer Galen Rowell ...

Each year on April 22, Earth Day is celebrated around the world. Here’s what the event is, how it started and why this year’s ...

If you’ve seen illustrations or models of the solar system, maybe you noticed that all the planets orbit the Sun in more or less the same plane, traveling in the same direction. But what is above and ...

When my colleagues and I send them out to explore our solar system, it's important for us to understand the 3D map of our space neighborhood. When you purchase through links on our site, we may earn ...