Earth is the only planet in the known universe that has the right combination of water, atmosphere, temperature, and chemical ...

He wasn't wrong—the sun is 99.8 percent of the mass of the solar system. But what is that giant ball of fire in the sky? How ...

We may not think about our planet on a day-to-day basis, but the world we live in is a pretty interesting place. The third ...

With a radius of 3,959 miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. Earth is also unique in terms of ...

Earth Day has been around since the '70s. Every year, over a billion people get involved with the initiatives. Here, learn ...

A new AI model from the University of Bern predicts planetary systems likely to host Earth-like planets. It could boost the ...

Need a new idea to keep kids entertained? Try stargazing. Free learning activities and videos about the solar system Free learning activities and videos about the solar system Free learning ...

A collection of down-to-Earth facts about our planet and its place in the solar system. This collection introduces the Sun as the main source of light and heat on Earth. It explains that the Earth ...

The tantalizing hints of a far planet ‘teeming’ with extraterrestrial life is some 120 light-years away from Earth, ...

It’s known for its bright and fast-moving shooting stars resulting from Halley’s comet, the most famous comet of all, which ...