It makes you think... what's really out there??
"I think I finally found the answer to a question I've been asked a 1000 times. 'Can we see the Great Wall of China from the #ISS?' Next to impossible with the naked eye. But I tried with an 800 mm tele lens. Still tough to spot," writes ESA Astronaut Alexander Gerst on 21 June 2018. [5568x3712][OS]