International Space Station astronaut, Terry Virts, tweeted this image of a Vulcan hand salute as a tribute to actor Leonard Nimoy, Spock from "Star Trek", who died February 27, 2015.
Cape Cod and Boston, Massaschusetts, Nimoy's home town are visible through the station window.
Nimoy's character, science officer Mr. Spock, served as an inspiration to generations of scientists, engineers, and sci-fi fans around the world.