On July 19, 2013, NASA’s Cassini orbiter snapped historic images of the Earth and Moon while on the far side of the giant ringed planet, Saturn. No surface features are discernible since the Earth is nearly 900 million miles (1.5 billion kilometers) away, however, its unique blue tinge caused by sunlight reflecting off the planet's oceans is very apparent.
On that day, NASA invited the public to join in the celebration of this event by asking all to wave at the ringed planet at specific times and sharing pictures over the Internet. More than 20,000 people around the world participated. Did you?