Crossword clues for weightlessness
Wiktionary
n. 1 (context uncountable English) The state of being free from the effects of gravity. 2 (context countable English) An experience or instance of being weightless.
WordNet
Wikipedia
Weightlessness, or an absence of 'weight', is an absence of stress and strain resulting from externally applied mechanical contact-forces, typically normal forces from floors, seats, beds, scales, and the like. Counterintuitively, a uniform gravitational field does not by itself cause stress or strain, and a body in free fall in such an environment experiences no g-force acceleration and feels weightless. This is also termed "zero-g" where the term is more correctly understood as meaning "zero g-force."
When bodies are acted upon by non-gravitational forces, as in a centrifuge, a rotating space station, or within a space ship with rockets firing, a sensation of weight is produced, as the contact forces from the moving structure act to overcome the body's inertia. In such cases, a sensation of weight, in the sense of a state of stress can occur, even if the gravitational field were zero. In such cases, g-forces are felt, and bodies are not weightless.
When the gravitational field is non-uniform, a body in free fall suffers tidal effects and is not stress-free. Near a black hole, such tidal effects can be very strong. In the case of the Earth, the effects are minor, especially on objects of relatively small dimension (such as the human body or a spacecraft) and the overall sensation of weightlessness in these cases is preserved. This condition is known as microgravity and it prevails in orbiting spacecraft.
In October 2015, the NASA Office of Inspector General issued a health hazards report related to human spaceflight, including a human mission to Mars.
Usage examples of "weightlessness".
George thrust his hand into the actuator hole, felt the metal plate and stepped forward into weightlessness.
The melting was supposed to be a high-gravity alleviant, and might be vulnerable to prolonged weightlessness.
Men tumbled out of their bunks, scrambling in the weightlessness for a handhold.
One of those gates connects to the place of weightlessness, which contains the large gate to Earth.
Saturday, 18870709:1024 Four or five gates later -- Pim was unsure of her count -- they emerged into weightlessness.
He could not move in the balloonlike insulation, but weightlessness claimed him for two or three seconds before the engines began to roar.
She continued to acclimate herself to the wonder of weightlessness, using the handholds to pull herself back and forth through the cabin, occasionally hanging upside down like a bat with her feet touching the ceiling.
The initial weightlessness when coasting commenced had knotted the old man with the characteristic nausea of free flight, and the pilot wished to save his passenger as much discomfort as possible.
The ship took a dislocative lurch: a feeling of tumbling and revolving slowly in weightlessness came over me.
Short shocks of rocket blasts alternated with nauseating weightlessness.
Somewhere in there the acceleration cuts out and we sail into sudden weightlessness and spin, drifting, helpless, but he holds on to me somehow and I have no idea, when it's over, if I screamed his name or God's, or what language, or if I managed to hold my tongue.
His body had a light weightlessness that put an edge on his reflexes, making them a shade too quick.
Vomiting in weightlessness equaled suffocation and so I concentrated desperately upon holding my gorge within me, revolving slowly, holding myself together, and all thoughts of the expedition, or our obligations to the natives of Folsom’s Planet, of the ethicality of the mission itself were subsumed in this larger necessity to control myself.
Having had Noonday, Thunderstorm, the Ro-Sayo, and a large number of former members of the Melange tour through her ship during the last several days, she was convinced that none of their gaits matched the footsteps she remembered transiting what was left of her hull after her accident, not even accounting for weightlessness and grav-boots.
In fact, he always had enjoyed the feeling of weightlessness, taking to zero-g combat training at Starfleet Academy like a newborn horta to a granite quarry.