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As the International Space Station astronauts return to Earth after a three-month stay, learn about the effects of weightlessness on the body. ... Weightlessness is more correctly termed microgravity. You are not actually weightless, because the Earth's gravity is holding you and everything in the shuttle in orbit.
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www.howstuffworks.com/weightlessness1.htm
www.howstuffworks.com/weightlessness1.htm
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Weightlessness - Wikipedia, the free encyclopedia
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Weightlessness is a phenomenon experienced by people during free-fall. Although the term zero gravity is often used as a synonym, weightlessness in orbit is not the result of the force of gravity b...
en.wikipedia.org/wiki/Weightlessness
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The phenomenon of "weightlessness" occurs when there is no force of support on your body. When your body is effectively in "free fall", accelerating downward at the acceleration of gravity, then you are not being supported.
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hyperphysics.phy-astr.gsu.edu/HBASE/mechanics/hump.html
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EFFECTS OF WEIGHTLESSNESS ... This free fall is the source of the "apparent weightlessness" which astronauts experience in orbit. Some of the very real effects of this "apparent weightlessness" include: 1. Loss of bone mass (similar to osteoporosis);
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www.vibrationdata.com/space/Weightlessness.html
www.vibrationdata.com/space/Weightlessness.html
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As the International Space Station astronauts return to Earth after a three-month stay, learn about the effects of weightlessness on the body. ... While weightlessness looks like fun, it places great demands on your body. Initially, you feel nauseated, dizzy and disoriented. Your head and sinuses swell and your legs shrink.
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science.howstuffworks.com/weightlessness.htm
science.howstuffworks.com/weightlessness.htm
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The feeling or impression of weightlessness comes from the lack of a force from the ground (normal force) having to push on your feet to keep you up.
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www.regentsprep.org/Regents/physics/phys01/accgravi/nog...
www.regentsprep.org/Regents/physics/phys01/accgravi/nogravsm.htm
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Britannica online encyclopedia article on weightlessness (physics), condition experienced while in free-fall, in which the effect of gravity is canceled by the inertial (e.g., centrifugal) force resulting from orbital flight. ... Crews of spacecraft are subject to the problems of weightlessness. It was learned from...
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www.britannica.com/EBchecked/topic/638979/weightlessnes...
www.britannica.com/EBchecked/topic/638979/weightlessness
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Spacedoc - Former NASA Scientist Astronaut Duane Graveline ... ; Research Scientist in Aerospace Medicine ; During his ten year USAF career Doctor Graveline selected prolonged weightlessness as his major area of research.
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www.spacedoc.net/weightlessness.html
www.spacedoc.net/weightlessness.html
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If all support is removed suddenly and the person begins to fall freely, he feels suddenly "weightless" - so weightlessness refers to a state of being in free fall in which there is no perceived support. The state of weightlessness can be achieved in several ways, all of which involve significant physical principles.
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hyperphysics.phy-astr.gsu.edu/hbase/mass.html
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