ESA astronaut Sophie Adenot inserts biological research samples into a science freezer

NASA astronaut Chris Williams shows off biology research hardware

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NASA astronaut Chris Williams inspects and configures a spacesuit jetpack

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NASA astronauts Chris Williams and Jessica Meir inspect and configure a spacesuit jetpack

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NASA astronaut Chris Williams smiles for the camera during a spacesuit fit verification

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NASA astronaut Jessica Meir processes samples for the StarSteel experiment

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NASA astronaut Jessica Meir configures hardware for the StarSteel experiment

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NASA astronauts Jessica Meir and Chris Williams familiarize themselves with spacewalking hardware

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NASA astronaut Mike Fincke shows off the Voyager Flytrap technology demonstration

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Astronaut Suni Williams displays production packs containing geneticallly engineered yeast

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Astronaut Suni Williams photographs the European Materials Ageing experiment hardware

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Astronaut Suni Williams installs the European Materials Ageing experiment

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Astronauts Engle and Truly in cockpit of Orbiter 101 prior to takeoff

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Astronaut Suni Williams checks research procedures on a computer tablet

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APOLLO X ASTRONAUTS - COUNTDOWN DEMONSTRATION TEST (CDDT) - CAPE

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Astronaut Nick Hague replaces components inside the BioFabrication Facility

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NASA astronaut Nichole Ayers works on an experimental carbon dioxide removal device

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STS-133 crew training with replacement astronaut Steve Bowen

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Astronaut Nick Hague Attends Joint Base Andrews Air Show

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Astronaut Suni Williams works outside the International Space Station

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Astronauts Anne McClain and Nichole Ayers checkout spacesuit hardware in the Quest airlock

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Astronaut Jack Lousma looks at map of Earth in ward room of Skylab cluster

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Astronaut Anne McClain assembles research hardware inside Kibo laboratory module

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Astronauts Kenneth D. Bowersox and Kent V. Rominger during bailout training

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Apollo 13 astronauts participate in walk-through of EVA timeline at KSC

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