The Modified B-707 (or K/C-135) used for low gravity training, (astronauts, etc.). It flew a paraboloic curve that simulated weightlessness.
It is important cause they will vomit
Using the Vomit Comet to experience moments of temporary weightlessness.
Flying in a parabolic arc is the best we can do presently. Astronauts have to take such training aboard the "Vomit Comet"
Astronaut candidates do "parabolic training" on a plane nicknamed the "Vomit Comet" (due to its tendency to induce motion sickness in passengers) so that they can experience weightlessness before being launched into space. If a potential astronauts is found to not be able to handle weightlessness, it's better to find that out before they actually get sent there for a long period of time. Also, weightless training gives them experience in how objects behave in zero-gee, so it's not a surprise when they get there.
A "vomit comet" is an aeroplane that briefly achieves zero G, allowing people and prospective astronauts to experience weightlessness.In general, 65 seconds of flight will achieve 25 seconds of weightlessness.Weightlessness produces nausea and sickness (vomit) in two out of three people and thus the aeroplane earns it's nickname.Zero Gravity Corporation in the US, will allow you - for a fee (Probably including a cleaning change) - to experience this.See related link for more information
Some words that rhyme with "grommet" include "comet," "vomit," and "bonnet."
it is called vomit comet.
They go underwater in a giant pool of water, it is the closest to 0 gravity on earth. Occasionally, they go into a plane called 'Vomit Comet'. The plane goes high up in the atmosphere and descends rapidly over a period of 30 seconds. The plane's descending speed hits the astronauts terminal velocity, hence the astronauts can simulate what it feels like to be weightless.
comet-vomit
because if you don't go to the vomit comit you will not know how to control your spaceship or your astraunatic devices and you have to know how to call or orbit another object because if anything goes wrong you need to contact another device to come help you
I'm uncertain what the question means. Astronauts do not normally 'train' while in space. They train in preparation for space. Assuming that is what the question means: There are two ways astronauts train for weightlessness. Neither is satisfactory. * They train it a place called the WIF or Water Immersion Facility. You can think of this as a swimming pool where the astronauts and the equipment they handle are made neutrally buoyant. That is, heavy or light material is attached so they neither float nor sink in water, but remain suspended in the water. The resistance of the water on movement and the fact that your internal organs still feel the pull of gravity limit it's value for simulating weightlessness in space. * They ride on an airplane that makes zero-g parabolic flights (visit link below). The airplane (called variously, the Vomit Comet, the Weightless Wonder, etc.) climes to a peak then allows itself to fall for about 30 seconds. When you are falling you are weightless, so this accurately simulates the weightlessness of space. But, but the short periods and the high forces when the plane pulls out of the fall make it of limited value for training.
Here on Earth, we live in a gravity field that is one G, or "earth-normal gravity". We evolved here, and we expect this. In free-fall, there is no apparent gravity, no feeling of weight. (Gravity still affects everything, but if you aren't resisting gravity, you don't FEEL gravity.) Some people are prone to drop-sickness, and are prone to lose their lunches in free-fall. The parabolic flight path of the "Vomit comet" gives you a couple of minutes of free-fall, so that you can get used to the feeling.