The only way to see the curve of the Earth is to fly more than 6 miles (10 kilometers) above its surface. Ever since the ancient Greeks first made observations of the circular Moon and the skies ...

Here's everything to know about Earth Day. Earth Day’s 2025 theme is "Our Power, Our Planet," according to earthday.org. The theme calls for everyone to unite around renewable energy so clean ...

Below, here’s everything you need to know about Earth Day 2025. Marked by millions around the world, Earth Day is an annual event designed to shine a light on the serious environmental problems ...