Rare Earth

Earth: The Power of the Planet episode 5 – Rare Earth: Life on Earth prospers because it enjoys the right amount of heat from the sun, and the atmosphere prevents meteorite bombardment. Geography series with Dr Iain Stewart.     Our planet is unique within the solar system. Four-and-a-half billion years ago it had a twin named Theia which was absorbed into the Earth, increasing its gravity and allowing it to form an atmosphere. Iain travels to Meteor Crater in Arizona to explore the atmosphere’s role in protecting us from bombardment by meteorites. Life on earth only prospers because it […]