The History of Earth - How Our Planet Formed - Full Documentary HD
Earth 101 | National Geographic
Planet Earth compared to other planets and stars in size.
Planet Earth seen from space (Full HD 1080p) ORIGINAL
Earth is the third planet from the Sun and the only astronomical object known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4.5 billion years ago. Earth's gravity interacts with other objects in space, especially the Sun and the Moon, Earth's only natural satellite. Earth revolves around the Sun in 365.26 days, a period known as an Earth year. During this time, Earth rotates about its axis about 366.26 times.