Happy International Day of Light ☀️ Join one of 500+ activities around the world today 🌍🌏🌎 to celebrate #light and the role it plays in #science, #art, #education & more! Info: https://t.co/aELyVWV0x9 #IDL2018 https://t.co/5xVl6zLV8Q

— ESA Science (@esascience) May 16, 2018