ESA astronaut Samantha Cristoforetti "cupping" a drop of water on the International Space Station in 2015 during her Futura mission.
Samantha commented on the image via Twitter: "On Earth, like on the International Space Station, water is limited. Let's use it wisely. We're all crew of spaceship Earth."
Read more about the Futura mission here: www.esa.int/Futura