To commemorate Earth Day, here are some mind-boggling photos taken from space by NASA and the internet famous Command Hadfield that show just how beautiful this planet really is. Earth Day is an annual event, celebrated on April 22, on which events are held worldwide to demonstrate support for environmental protection. It was first celebrated in 1970, and is now coordinated globally by the Earth Day Network, and celebrated in more than 192 countries each year. Continue reading for more.