ESA (European Space Agency) astronaut Samantha Cristoforetti on Feb. 28, 2015 tweeted this photo and gives a final salute to Star Trek's Leonard Nimoy who passed away recently. Cristoforetti is a flight engineer on the International Space Station. She commented in the Tweet ""Of all the souls I have encountered.. his was the most human." Thx @TheRealNimoy for bringing Spock to life for us"