
Expedition 51 crewmember Jack Fischer signs a commemorative book in a traditional ceremony.

Expedition 51 crewmember Fyodor Yurchikhin signs a commemorative book in a traditional ceremony.

Expedition 51 crewmember Fyodor Yurchikhin of the Russian Federal Space Agency (Roscosmos, right) answers a reporter’s question.

Expedition 51 crewmember Jack Fischer of NASA displays a medal derived from the Apollo-Soyuz crew patch.

This image from the HiRISE instrument on NASA’s Mars Reconnaissance Orbiter was acquired to take a closer look at a…

The Prandtl-M completes a successful research flight.

Test flights of the Prandtl-M have resumed. The airframe also is the basis for another aircraft that will collect weather…

A Prandtl-M aerodynamic model flies following an air launch from a remotely piloted Carbon Cub.

Dave Berger, right, and John Bodylski prepare the Prandtl-M for a test flight.

Expedition 50 Flight Engineer Thomas Pesquet of the European Space Agency (ESA) photographed brightly glowing auroras from his vantage point…