Celebrating Earth Day 2013 - with images from space

For over 40 years, Earth Day has been celebrated every year on April 22. It was first observed on April 22, 1970, when 20 million Americans took to the streets, parks and auditoriums to demonstrate for a healthy, sustainable environment

On the occasion of Earth Day, the US Space Agency NASA put together the video "Earth from Orbit in 2012" showing the best views of our planet from space in 2012, including true-color satellite images, Earth science data visualizations, time lapses from the International Space Station and computer models.