RT @universetoday: Astonishing picture of Earth compared to all its water and air – sploid.gizmodo.com/astonishing-pi… h/t @DanSpace77 http://t.co/B4IrmO2u4E
RT @universetoday: Astonishing picture of Earth compared to all its water and air – sploid.gizmodo.com/astonishing-pi… h/t @DanSpace77 http://t.co/B4IrmO2u4E