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.

Buzz Aldrin's self-portrait during the Gemini 12 mission in 1966 is the first-ever selfie from space.

The image is part of a selection of prints of vintage photographs by NASA's pioneering astronauts, taken in space and on the Moon, titled "From the Earth to the Moon: Vintage NASA" up for auction at London's Bloomsbury Auctions, February 26, 2015.

The Aldrin print is expected to fetch between 900-1,200 USD.

Buzz Aldrin may claim the first space selfie from back in 1966, but the trend is still going strong today. Astronaut Barry "Butch" Wilmore captured this image in February 2015 while running cable outside the International Space Station.

It proved a hit on NASA's Facebook page, earning over 54,000 likes.

Japan Aerospace Exploration Agency astronaut Aki Hoshide, part of the International Space Station Expedition 32 crew, took this selfie during a spacewalk in 2012 that lasted over six hours.

The lens-flare-like splash of light over his shoulder is the sun.

Astronaut Alan L. Bean, Lunar Module pilot for the Apollo 12 lunar landing mission, holds a Special Environmental Sample Container filled with lunar soil collected during the extravehicular activity (EVA) in which Astronauts Charles Conrad Jr., commander, and Bean participated. Connrad, who took this picture, is reflected in the helmet visor of the Lunar Module pilot.

Extravehicular Activity (EVA) 4 on Flight Day 7 - handheld camera views - of the Hubble Space Telescope second servicing mission (HST SM-02). Mission Specialist Greg Harbaugh works to install the new Solar Array Drive Electronics 2 (SADE-2) on the Bay 7 door (006-7).

Harbaugh holds the Closed Circuit Television (CCT) camera close to the Bay 7 door (009). View of the CCT camera next to the HST (008). Inadvertant and blurry views of payload bay (010-13). View of the Earth limb partially blocked by an extravehicular mobility unit (EMU) backpack (014-16). Portrait view of Harbaugh next to the HST with the CCT camera ball stack to right of frame (017-18, 023-24). Portrait view of Joe Tanner with the Earth limb above him (019-22). View taken from the Remote Manipulator System (RMS) arm suspended high above the payload bay of the crew compartment (025-26). Good documentatary view of the peeling Multilayer Insulation (MLI) as Harbaugh prepares to install a MLI cover over the damaged area near the top of HST (027). Blurry view of moon (028). Excellent view of Tanner with Earth limb and sunburst; very artistic looking (029). Similar view of Tanner with Earth limb and sunburst (030). Dark payload bay view of Tanner translating along Second Axial Carrier (SAC) (031). Inadvertant views of EMU parts (032-35). View looking forward to crew compartment (036). Inadvertant photo of RMS arm (037).

Astronaut Joseph R. Tanner, STS-115 Mission Specialist, used a digital still camera to expose a photo of his helmet visor.

Also visible in the reflections in the visor is the station's Canadarm2.

Expedition Four Flight Engineer Daniel Bursch's reflection is visible in the Early External Thermal Control System EETCS radiator as he takes documentation photographs during EVA 3 operations.

Also reflected is an Articulating Portable Foot Restraint APFR.

Mission Specialists Jeff Wisoff and Michael Lopez-Alegria during Extravehicular Activity (EVA) on the International Space Station (ISS).

Lopez-Alegria's helmet reflects Wisoff. Wisoff's helmet reflects Lopez-Alegria (025-27).

Astronaut Rick Mastracchio takes a selfie during a spacewalk on the International Space Station, April 23, 2014.

Part of the upper body of NASA astronaut Rick Mastracchio can be seen in a "selfie" or self-portrait during a spacewalk to replace a failed backup computer relay box in the SO truss of the International Space Station, April 22, 2014.

He was accompanied on the spacewalk by fellow Flight Engineer Steve Swanson of NASA.

Humans aren't the only ones to embrace space selfies. NASA's Mars Curiosity rover delivered this selfie from the surface of the Red Planet in 2014 to mark the occasion of its first full Martian year.

The selfie is composed of dozens of images patched together by NASA into a complete picture. Curiosity was at a site called Windjana at the time.

The curve of the Earth behind NASA astronaut Mike Hopkins makes a dramatic backdrop for this selfie taken December 24, 2013.

Hopkins was a member of Expedition 38 and participated in a spacewalk to change out a pump module on the International Space Station.

Italian Astronaut Samantha Cristoforetti sent the people of Macedonia a greeting from space on twitter with this selfie, 2014.

Cristoforetti began her mission on the International Space Station November 23, 2014.