ISS042E237302 (02/09/2015) --- Aboard the International Space Station on Feb. 9, 2015 NASA astronaut Terry Virts while viewing through the Cupola window captured this image of the African continent. Virts tweeted the photo to his many fans with the comment: "Sun glint on one of a thousand rivers in the heart of #Africa, this one in #Angola" .

ISS042E207665 (02/03/2015) --- (ESA) European Space Agency astronaut Samantha Cristoforetti, and NASA astronaut Terry Virts are working with configuration tasks aboard the International Space Station on Feb. 3, 2015. Virts tweeted this photo with the comment "@AstroSamantha and I kick off a year of "reconfig", preparing for multiple docked cargo and manned vehicles".

ISS040-E-012015 (14 June 2014) --- One of the Expedition 40 crew members photographed this image on June 14, 2014. European Space Agency astronaut Alexander Gerst, in a Tweeted message on June 15, identified the sprinkle of light in the upper right hand corner of the photo as the launch of a Russian satellite.

ISS040-E-045605 (7 July 2014) --- The International Space Station, including these two temporarily docked Russian spacecraft, made more than one pass near Typhoon Neoguri on July 7, and Expedition 40 Flight Engineers Reid Wiseman of NASA and Alexander Gerst of the European Space Agency captured its startling dimensions in a day-long series of still photos. In a tweet later in the day, Gerst marveled that even with a fish-eye lens he couldn't capture the whole storm. A 28mm focal length was used for a small sequence of oblique pictures such as this one. The picture was taken at 06:57:53 GMT on July 7, 2014.

ISS042e291952 (02/28/2015) --- ESA (European Space Agency) astronaut Samantha Cristoforetti on Feb. 28, 2015 tweeted this photo and gives a final salute to Star Treks' 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"

An attendee at a NASA Social tweets on her cell phone at a NASA Social exploring science on the ISS at NASA Headquarters, Wednesday, Feb. 20, 2013 in Washington. Photo Credit: (NASA/Carla Cioffi)

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ISS042E135486 (01/10/2015) --- Just another sunny day in the Caribbean sea as viewed by astronauts aboard the International Space Station. This image was tweeted out by NASA astronaut Terry Virts as he captured the Earth observation of #Cuba and #Bahamas on Jan. 10, 2015.

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ISS042E136080 (01/15/2015) --- US astronaut Barry "Butch" Wilmore, Expedition 42 Commander on the International Space Station, is photographed in the Unity Node 1 with three floating mustard bottles recently delivered to the ISS. This picture was taken by his fellow US astronaut Terry Virts.

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Earth Observations taken by Expedition 34 crewmember.

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ISS042e136094 (Jan 15, 2015) -- Interior view looking forward (FWD) in the Destiny U.S. Laboratory during the crew's sleep period, with the main lights turned off. The pink glow comes from the Vegetable Production System (Veggie) greenhouse, housed in the Columbus European Laboratory.

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ISS042E292494 (03/01/2015) --- U.S. astronauts Barry "Butch" Wilmore and Terry Virts performed three separate spacewalks to prepare the International Space Station for upcoming U.S. commercial spacecraft currently in development. Virts tweeted this image on March 1, 2015 with the comment "Still thinking about that #awesome #spacewalk yesterday with #AstroButch!"

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Earth Observations taken by Expedition 34 crewmember.

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ISS042E136404 (01/11/2015) --- This image of Cyclone Chedza, headed for the Island nation of Madagascar, off the African coast was taken by a member of Expedition 42 on the International Space Station Jan. 11, 2015.

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Earth Observations taken by Expedition 34 crewmember.

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Earth Observations taken by Expedition 34 crewmember.

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ISS042E275158 (02/15/2015) --- US Astronaut Terry Virts tweeted this earth observation from the International Space Station on Feb. 15, 2015. Virts described the image as "#EarthArt northeast #Libya.

ISS042E237341 (02/09/2015) --- Twitter image from US Astronaut Terry Virts of the Red Sea in the Middle East on Feb. 09, 2015. Terry labeled it "earth art." Terry is a flight engineer of Expedition 42 on the International Space Station.

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ISS042E215971 (02/06/2015) --- NASA US Astronaut Terry Virts on Feb. 6, 2015 captured this Earth observation of Ireland, United Kingdom and Scandinavia on a moonlit night under an amazing and ever-changing aurora. Terry is a flight engineer on the international Space Station with Expedition 42.

Earth Observations taken by Expedition 34 crewmember.

ISS042E300570 (03/04/2015) --- NASA Astronaut Terry Virts on the International Space Station tweeted this sunny day Caribbean image out to his social media fans on Mar. 4, 2015 with this attached comment: "#Cuba is surrounded by some unbelievable beaches and blue-green waters".