This file is from Wikimedia Commons (production) and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionISS-42 Samantha Cristoforetti Leonard Nimoy tribute.jpg
English: 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 the previous day. Cristoforetti, who in the photo also wears an insignia common to members of Star Trek's fictional Starfleet, was 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"
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.