We’re nearing the end of ‘Earth Day’ (22nd April) but there’s still time to take part in a huge global event being organised by NASA: the agency is inviting you to send it your selfies.

The idea is that NASA is momentarily tired of taking gazillions of gigabytes of digital images of our planet and the universe beyond, and instead wants to create a picture with your input. It’s monitoring Facebook, Twitter, Instagram and Google + for the hashtag #GlobalSelfie and will stitch together all the pictures it finds thusly tagged into one giant mosaic on top of the Blue Marble.

All you need to do is print out the sign you’ll find at this link, write your location on it, and post a selfie of you holding it using the hashtag #GlobalSelfie. There’s still time to get plenty with the South African night sky on there.

Adam is the Editorial Director at htxt media. He has been writing about technology for almost two full decades now. In a previous life, he was the editor of PC Format and Digital Camera Shopper in the UK, before going on to work as a freelance journalist for seven years. His work has appeared in or on Stuff, The Guardian, Linux Format, TechRadar, Wired.co.uk, PC Gamer, Green Futures, The Journalist, The Ecologist and The Review. Adam moved to South Africa in 2012 and loves 3D printers, MakerFairs and tech hubs. He hates seafood. None of his friends remember this when cooking.