Astronaut Philippe Perrin, STS-111 mission specialist, wears a training version of the Extravehicular Mobility Unit space suit during an underwater simulation of extravehicular activity. Perrin, representing CNES, the French Space Agency, was joined by astronaut Franklin R. Chang-Diaz (out of frame) for the simulation, conducted in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center. NASA
Hubert Vykukal demonstrates mobility of the Hardsuit AX-3 Space Suit design in 1977. NASA/Ames Research Center
Astronaut Edgar D. Mitchell, Apollo 14 Lunar Module pilot, moves across the lunar surface as he looks over a traverse map during extravehicular activity in 1971. Lunar dust can be seen clinging to the boots and legs of the space suit. NASA
Astronaut Edward M. Fincke, Expedition 9 NASA ISS science officer and flight engineer, wearing a Russian Orlan spacesuit, participates in the third of four sessions of extravehicular activities performed by the Expedition 9 crew during their six-month mission in 2004. NASA
Russian cosmonaut Maxim Suraev, Expedition 22 flight engineer, poses for a photo with two Russian Orlan-MK spacesuits in the Pirs Docking Compartment of the International Space Station in 2010. NASA
Geologist-Astronaut Harrison Schmitt, Apollo 17 lunar module pilot, uses an adjustable sampling scoop to retrieve lunar samples during the second extravehicular activity, at Station 5 at the Taurus- Littrow landing site in 1972. The cohesive nature of the lunar soil is born out by the "dirty" appearance of Schmitt's space suit. NASA
Chimpanzee Enos pictured wearing a space suit and wrist tethers in 1961. Enos would orbit the earth in 1961, in a full dress rehearsal for John Glenn's 1962 flight. NASA
Astronaut John H. Glenn Jr., pilot of the Mercury Atlas 6 space mission, poses in his pressure suit and helmet for press photographers at Cape Canaveral during MA-6 pre-flight activities in 1962. NASA
Astronaut Edward White is seen in his space suit helmet in 1965 NASA
The AX-5 Space Suit is adjusted to accommodate an astronaut's small size. The hard suit, while maintaining mobility, offers the astronaut greater protection from debris, micrometerorite penetration, radiation and thermal loads during EVA operations. Hubert "Vic" Vykukal/NASA
Astronaut and mission specialist for STS-73, Catherine G. Coleman, dons a high fidelity training version of the Extravehicular Mobility Unit space suit at the Johnson Space Center's Weightless Environment Training Facility.
Iran certainly seems and sounds different eight months into President Hassan Rouhani's term. Promising an "end to extremism," Mr. Rouhani signed an interim nuclear deal with world powers months ago, and now Tehran is pushing ahead on a final agreement.