Learn about Earth Day founder Gaylord Nelson (1916–2005) and how environmental disasters of his day inspired the creation of Earth Day in 1970. On December 7, 1972, Apollo 17 astronauts captured a now ...

These clips are from the BBC series ... An explanation of how seasons and day length are affected by the Earth's tilt. The Earth is not completely upright - it leans at a slight angle, so that ...

Every morning, here on Earth, the sun rises in the East – and the day begins.Later it sets in the West – and it becomes night. But have you ever wondered why that happens? Humans once believed ...

This is the third Mother Earth Day celebrated within the UN Decade on Ecosystem Restoration. Ecosystems support all life on Earth. The healthier our ecosystems are, the healthier the planet - and ...