On a spacewalk, astronaut Owen K. Garriott, science pilot, retrieves an imagery experiment from the Apollo Telescope Mount attached to the Skylab in Earth orbit in 1973. NASA
Astronaut James B. Irwin, lunar module pilot, works at the Lunar Roving Vehicle during the first Apollo 15 lunar surface extravehicular activity at the Hadley-Apennine landing site in 1971. The shadow of the Lunar Module "Falcon" is in the foreground. This view is looking northeast, with Mount Hadley in the background. The photograph was taken by astronaut David R. Scott, commander. NASA
The Apollo 9 Command/Service Modules (CSM) nicknamed "Gumdrop" and Lunar Module (LM), nicknamed "Spider" are shown docked together as Command Module pilot David R. Scott stands in the open hatch. Astronaut Russell L. Schweickart, Lunar Module pilot, took this photograph of Scott during his EVA as he stood on the porch outside the Lunar Module. NASA
Astronaut Dale A. Gardner, having just completed the major portion of his second extravehicular activity (EVA) period in three days, holds up a "For Sale" sign refering to the two satellites, Palapa B-2 and Westar 6 that they retrieved from orbit after their Payload Assist Modules (PAM) failed to fire. NASA
Astronaut Robert Satcher uses a digital still camera to take a self-portrait during the STS-129 mission's first spacewalk in 2009. NASA
Astronaut Robert L. Curbeam, Jr., STS-98 mission specialist, was photographed during the second of three spacewalks by a member of the Expedition 1 crew in the newly installed Destiny laboratory. NASA
On June 3, 1965 Edward H. White II became the first American to step outside his spacecraft and let go, effectively setting himself adrift in the zero gravity of space. For 23 minutes White floated and maneuvered himself around the Gemini spacecraft while logging 6500 miles during his orbital stroll. White was attached to the spacecraft by a 25 foot umbilical line and a 23-ft. tether line, both wrapped in gold tape to form one cord. NASA
STS-88 mission specialist James Newman, holding on to a handrail, waves back at the camera during the first of three Extravehicular activities performed during the 1998 mission. The orbiter can be seen reflected in his visor NASA
Astronaut Michael E. Lopez-Alegria (r.), Expedition 14 commander and NASA space station science officer; and cosmonaut Mikhail Tyurin, flight engineer representing Russia's Federal Space Agency, perform a Russian Orlan spacesuit fit check in the Pirs Docking Compartment of the International Space Station. NASA
Backdropped against the blue and white Earth 130 nautical miles below, astronaut Mark C. Lee tests the Simplified Aid for EVA Rescue (SAFER) system in 1994. NASA
Saudi Arabia began airstrikes Wednesday against Houthi rebels in Yemen. Saudi Arabia, the United Arab Emirates, Kuwait, Qatar and Bahrain said they would answer a request from Yemeni President Abed Rabbo Mansour Hadi 'to protect Yemen.'
ByKen Dilanian, AP Intelligence Writer
Saudi Arabia began airstrikes Wednesday against Houthi rebel positions in Yemen, vowing that the Sunni kingdom will do "anything necessary" to protect its neighbor from Iran-backed Shiite rebels.