ISS Commander & Cosmonaut Max Suraev | Russian EVA-40

ISS Cosmonaut Sasha Samokutaev | Russian EVA-40

Cosmonaut Elena Serova: Airlock V2 | International Space Station

Cosmonaut Elena Serova: Airlock V1 | International Space Station

"Universal Highway: Adventure awaits" by Tommy Richardsen

Third Substantial Solar Flare in 2 Days | NASA SDO

Second Substantial Solar Flare in Two Days | NASA SDO

Video: Artist’s impression of exocomets around Beta Pictoris

Artist’s impression of exocomets around Beta Pictoris

Comet 67P | Oct. 18, 2014: Color Image 2 | European Space Agency

Comet 67P | Oct. 18, 2014: Color Image 1 | European Space Agency

Comet 67P on Oct. 18, 2014: NAVCAM | European Space Agency

Ring of Stellar Fire | NASA Spitzer Space Telescope

NASA Astronaut Walter Schirra Reflects | Apollo 7

Saturn IVB Rocket Stage in Earth Orbit | NASA Apollo

Apollo 14 Crew Training | NASA