It’s cooler than it sounds. From NASA’s announcement:
NASA astronauts brought home the first ever images of the whole planet from space. Now NASA satellites capture new images of Earth every second. For Earth Day we are trying to create an image of Earth from the ground up while also fostering a collection of portraits of the people of Earth. Once those pictures stream around the world on Earth Day, the individual pictures tagged #GlobalSelfie will be used to create a mosaic image of Earth — a new “Blue Marble” built bit by bit with your photos.
Need an idea of what kind of picture to take? Get outside and show us mountains, parks, the sky, rivers, lakes — wherever you are, there’s your picture. Tell us where you are in a sign, words written in the sand, spelled out with rocks.
NASA has also created a sign you can print out and hold up in your photo. We’ve posted it at the bottom of this page.
Post the picture to the #GlobalSelfie event page on Facebook or the #GlobalSelfie group on Flickr, or post to Twitter, Instagram, or Google+ using the hashtag #GlobalSelfie. The Earth mosaic image, made of your photo and thousands of others from around the world, and a video using the images, will be released in May.
We’d love to see what you’re submitting to NASA! Tweet your picture to us or post it on our Facebook wall.