Thus, it may also be described as a set of. An aurora is a natural phenomenon which is characterised by a display of a natural-coloured green, red, yellow or white light in the sky. It is predomi. ISRO was formed in with a vision to develop and harness space technology in national development, while pursuing planetary exploration and space science research.
A Lagrangian point is a position or location in space where the combined gravitational forces of two large bodies is equal to the centrifugal force that is felt by a third body which is relatively smaller. The two large bodies here may be the Earth and Sun or the Earth and Moon. Description: A lagrangian point is also known as a Lagrange point, Liberation point, or L-point. These points are loc. Choose your reason below and click on the Report button. This will alert our moderators to take action.
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ET Secure IT. Suggest a new Definition Proposed definitions will be considered for inclusion in the Economictimes. Zenith Zenith is the imaginary point that is directly above a particular location on the celestial sphere. It is vertically opposite to the apparent gravitational force i. It is the highest point on the sphere and thus, the farthest up from the gravitational force. Definition: Zero Gravity or Zero-G can simply be defined as the state or condition of weightlessness. It also refers to the state in which the net or an apparent effect of gravity i.
Description: The condition of apparent weightlessness occurs when a body in a gravitational field changes places to neutralize its gravitational force. For example, astronauts are seen floating around in the outer space because of this phenomenon. Astronauts orbiting the Earth in a space station experience zero gravity or weightlessness because their spacecraft continuously undergoes changes in velocity in its orbit in order to prevent it from being pulled into the atmosphere.
This acceleration, which is often known as a centrifugal force, counterbalances gravity. We can express the definition of microgravity in other words:.
Microgravity, also called zero-gravity or weightlessness , is the absence of gravity. So that, a micro-g environment is one where the acceleration induced by gravity has little or no measurable effect, gravity itself does not change. It is best illustrated by the following photos in a parabolic flight:. One of the most promising areas for the commercialization of space is in the field of microgravity. Microgravity allows the research and development of new materials which cannot be made on Earth due to gravity.
These new materials can be used to speed up future computers, reduce pollution, improve fiber optics, and enable medical breakthroughs to cure diseases. Source: NASA. In order to see other microgravity in space video clips click here. How to achieve microgravity Just let it fall!. Indeed, there is no other way. It is not possible, following the physic concepts we know, to thwart the force of gravity and to reproduce the consequences of a microgravity environment without letting fall.
The only way to escape from the feeling of gravity is letting it make its work. Here we have some solutions:. Drop towers. Drop towers were invented by W. Watts in Bristol in , who first used them to build bullets. They are high towers where researchers can let their experiments fall, obtaining up to ten of seconds of weightlessness. It is metres tall and can get up to 9. Parabolic flights.
They lie in an airplane maneuvering without lift and making up for the drag of air with its engines. This way, the only force acting inside the airplane is the gravity free fall. The precision of this mechanism is limited, though, reducing the reaction of gravity to a hundredth. E uropean S pace A gency ESA owns an Airbus equipped to perform such maneuvers, which give up to 25 seconds of weightlessness.
Sounding rockets. Without reaching a stable orbit, a rocket launched vertically can achieve during certain time perfect weightlessness conditions. Retrievable capsules. In the ISS, experiments can be online for very long periods of time.
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