In Pictures: Exploring Mars with Curiosity
In Pictures: Meteors
In Pictures: Space photos of the day: Dancing with the Stars
In Pictures: Space photos of the day: Black Holes
In Pictures: Space Photos of the Day: Asteroids
In Pictures: Space photos of the day: Visions of the future
In Pictures: Space photos of the day: Massive Storms
In Pictures: Space photos of the day: Gas giants
In Pictures: Space photos of the day: Heavenly Rings
In Pictures: Space photos of the day: Female Astronauts
In Pictures: Space photos of the day: The Moon
In Pictures: Space photos of the day: A Blue Planet
Astronaut Edward M. (Mike) Fincke, Expedition 9 NASA ISS science officer and flight engineer, 'juggles' fresh fruit in the Destiny laboratory of the International Space Station. The weightless environment of space proves to be an ideal location for some tasks not so easily accomplished in Earth's gravity.
During a 1968 visit to Langley, then CBS News Anchorman Walter Cronkite tries out the Reduced Gravity Simulator, a series of cable-supported slings designed to approximate the Moons gravity, 1/6th that of Earths.
Noted physicist Stephen Hawking (c.) enjoys zero gravity during a flight aboard a modified Boeing 727 aircraft owned by Zero Gravity Corp. Hawking, who is almost completely paralyzed, is being rotated in air by Peter Diamandis (r.), founder of the Zero G Corp., and Byron Lichtenberg, former shuttle payload specialist and now president of Zero G.
The Reduced-Gravity Program provides the unique weightless or zero-g environment of space flight for testing and training of human and hardware reactions. The reduced-gravity environment is obtained with a specially modified KC-135A turbojet transport which flies parabolic arcs to produce weightless periods of 20 to 25 seconds.
A candle flame is seen in normal 1-G (Earth) gravity (r.) and in a zero-gravity environment.
A water balloon is popped in a zero-gravity environment.
Astronauts fly in a 'zero-g' trajectory at Wright Air Development Center. Weightless flights were a new form of training for the Mercury astronauts and parabolic flights that briefly go beyond the Earth's tug of gravity continue to be used for spaceflight training purposes. These flights are nicknamed the "vomit comet" because of the nausea that is often induced.
Astronaut/aquanaut Nicholas J. M. Patrick stands on his hands to simulate the one-sixth gravity on the lunar surface during an undersea session of extravehicular activity (EVA) for the 13th NASA Extreme Environment Mission Operations (NEEMO) mission.
Astronaut Edward H. White II, pilot for the Gemini-Titan 4 space flight, floats in zero gravity of space. The extravehicular activity was performed during the third revolution of the Gemini 4 spacecraft. White is attached to the spacecraft by a 25-ft. umbilical line and a 23-ft. tether line, both wrapped in gold tape to form one cord. In his right hand White carries a Hand-Held Self-Maneuvering Unit (HHSMU). The visor of his helmet is gold plated to protect him from the unfiltered rays of the sun.
STS 61-B crewmembers training on the KC-135 in zero-g. Views include Astronaut Sherwood C. Spring, mission specialist, donning an extravehicular mobility unit (EMU) during the few moments of zero-gravity aboard the KC-135.
A test subject wears a jet-shoe apparatus and rests in a sling support in 1967.
Teacher Christa McAuliffe is seen on the KC-135 for zero-G training. McAuliffe, 51-L citizen observer/payload specialist, floats forward and upward during a few moments of weightlessness aboard a KC-135 aircraft. McAuliffe was one of seven crew members killed in the Space Shuttle Challenger mission.
Red-colored water is seen after a water balloon bursts in zero-g.
A test subject is suited up for studies on the Reduced Gravity Walking Simulator located in the hangar at Langley Research Center. This position meant that a person's legs experienced only one sixth of their weight, which was the equivalent of being on the lunar surface.
STS 61-B crewmembers train on the KC-135 in zero-G. 
Photos of the Day: Photos of the day 05/24
In Pictures: Ultra-Orthodox Jews
Photos of the Day: Photos of the day 05/23
In Pictures: Huge hurricanes
In Pictures: Oh to be young again, Mr. President!
In Pictures: Facing the devastation of the Oklahoma tornadoes
Photos of the Day: Photos of the day 05/22
Photos of the Day: Photos of the day 05/21
In Pictures: Sinkholes around the world
The suspected killers of a British soldier in London this week claimed to have acted in response to the West's 'war on Islam' – raising concerns that their view is shared by more European Muslims.
After two men butchered a British soldier in broad daylight Wednesday cameras captured them uttering: "We must fight them as they fight us. An eye for an eye, a tooth for a tooth,” said one.
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