As far as humans can tell, space is infinite; it has no end or borders. Scientists believe that space will always seem infinite to humans for two reasons. First, our investigation of space has never found an edge (or any indications of an edge). Second, measurements show that space is expanding fast
Rather than being composed of anything, outer space is loosely defined as the void between the planets, stars and other objects in the universe. While not a perfect vacuum, scientists consider outer space to be a hard vacuum, with a pressure level close to zero. Nevertheless, space is not completely
Space-time is a mathematical and physical construct that explains how space and time interact; the three physical dimensions and one time dimension combine to create the four-dimensional nature of the universe. Space-time resulted from Albert Einstein's work on relativity.
The first person to travel to space was the Russian, Yuri Gagarin in 1961. Gagarin orbited Earth one time before re-entering the atmosphere and successfully returning to land. The entire trip took 108 minutes.
Alan B. Shepherd became the first American in space on May 5, 1961. He made a sub-orbital flight lasting 15 minutes aboard the Freedom 7 and reached an altitude of 116 miles in space.
There is no air in space because there is no gravity to condense the molecules of gases found there into air. On Earth, gravity holds nitrogen, oxygen and the other gases that compose the atmosphere together, but only to about 60 miles above the surface.
A number of positive space initiatives in universities and colleges work to create receptive, welcoming environments for bisexual, gender variant, intersex, gay, lesbian, questioning, transgender, transsexual and two-spirit communities and individuals. The University of British Columbia and George B
Sound is unable to travel through truly empty space. The phenomenon known as sound is the perception of alternating waves of compression passing through a medium. Unlike light, which is able to propagate without a medium, sound waves must have a medium, such as air, water or rock, to carry them.
According to Austin Community College, third spacing is the build-up of fluids in parts of the body that typically have little or no fluid. This is contrasted with second spacing, where excess fluids accumulate in the tissue.
The first woman in space was Valentina Tereshkova, a Soviet cosmonaut, the equivalent of an American astronaut. On June 16, 1963, she orbited the Earth while aboard Vostok 6. She made 48 orbits over nearly three days in space.