NASA astronaut Stephanie Wilson and ESA astronaut Alexander Guerst during their training along the rim of the Caldera Blanca volcano.

Credits: ESA / A. Romeo Larger image

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp...