10. Why does gravity virtually zero in the exosphere?
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Answer:
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.e. the gravitational force) is zero.
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. Hence, they experience Zero Gravity or weightlessness.
Sir Isaac Newton, an English mathematician and physicist, discovered gravity. To help explain this concept better, we can take an example of a block of lead in free fall on planet x. The block is said to be in a state of weightlessness even though it is being pulled down by the planet's gravity. Satellites, projectiles, galaxies, planets etc. are influenced by the force of gravity. Zero gravity on earth is 0 m/s2. Not having to bear weight on your feet appears relaxing but in the long term, you could face many health problems like the weakening of bones and muscles. Other changes also take place, which have been identified by numerous studies. The most common problem faced by humans in the initial hours of weightlessness is known as SAS (Space Adaptation Syndrome) like vomiting, nausea etc.
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