Before we talk about zero gravity on Earth , it's important to briefly explain how it all began. An apple was responsible for Isaac Newton realizing that the speed of an object hitting the ground and the steady movement of the stars in the cosmos were governed by the same force. If you'd like to delve deeper, you can consult the article on the importance of gravity.
In this sense, all celestial bodies are irrevocably drawn together, and although it may sound like the beginning of a romance novel, gravity is the Cupid in the history of the cosmos, governing all its currents, despite being considered a fragile force (one only has to think of Earth's gravitational pull and its formidable mass ). To learn more about the force of gravity, you can visit [website address missing].
Furthermore, to continue discussing gravity on Earth, another scientist, Sir Isaac Newton, was the first to formulate a theory that explained the trajectory of bodies in the universe with a simple formula : the gravitational pull of two bodies is equal to the product of their masses and, conversely, equal to the square of the distance between them. If you would like to learn more about how this theory relates to other celestial bodies, we recommend reading about planetary gravity.
However, despite minute differences between gravity at the poles and at the equator, gravity is a force from which escape is unlikely. Zero gravity does not exist, not even in the sky. What happens to astronauts on space stations, stationed several hundred meters above the Earth (the International Space Station is 400 km above the Earth), is that they are in free fall.
“Two bodies are falling within the same gravitational field. However, there is no difference in forces between them,” explains Fernando Pina, a mathematician at the Spanish company Deimos Space. Try as we might, it's unlikely that we can escape Earth's gravitational pull within the atmosphere. We can only simulate the feeling of being farther away from gravity in two ways: by falling from vertical towers, where the sensation of weightlessness lasts only a few seconds, or through imaginary flights.
Time multiplied when trying to demonstrate 0 gravity on earth
The airplane climbs in flight with a bank angle of approximately 47 degrees. As it ascends to an altitude between 4.000 and 8.000 meters, the interior of the aircraft experiences a resistance due to the Earth's gravitational pull and inertia. Inertia, simply put, is the phenomenon that makes us cling to our seats in a vehicle when it accelerates . It is created by the constant increase in speed, necessary for the airplane to take off and climb away from the Earth. If it does not accelerate beyond the G-force, or the point of maximum acceleration, of an organism, which in the case of Earth is 9,81 m/s², it cannot gain altitude.
Once maximum altitude is reached, the aircraft's engines are shut down almost completely (leaving only the minimum power needed to overcome the air resistance during the descent). This allows the aircraft to act as a shield for the interior, its own weight counteracting the air resistance . At this point, the descent begins inevitably, always under close observation, as the pilot has already taken over the task of pointing the nose towards the horizon (an exercise that lasts about 20 seconds). Because the Earth's gravitational pull is constant, the aircraft experiences a feeling of lightness.
Both the aircraft and its interior sway and collapse simultaneously, equally subject to the force of attraction, but the force between them is so microscopic that gravity almost completely disappears. It's as if the body inside the aircraft were plummeting into the void, because within that point, the gravitational pull of the mass-aircraft is gradual.
During these moments of freefall, about 20 at a time depending on who you're flying with, you notice microgravity, or the near-total absence of gravity . The aircraft, which has descended at an angle of about 20 degrees (it doesn't plummet nose-first), restarts its engines three times during this cycle to recover from the steep incline and avoid crashing, of course. These climbs and descents mimic the same situation, providing several minutes of weightlessness during the flights.
During the inspected descent, the engine power can be reduced, meaning the aircraft can be slowed down so that the difficulty experienced is not close to zero, but closer to the gravity of the Moon (1/6 of Earth's gravity) or Mars (1/3 of Earth's). For a better understanding of space travel, see Manned Spaceflight.
Earth gravity map
In another sense, another way to relate to zero gravity on Earth is by using a map of the planet. That is, the acceleration due to gravity varies slightly across the planet. The ellipsoidal shape of the Earth and the mass discrepancy in its plane cause a fluctuation between 9,78 m/s² at the equator and 9,83 m/s² at the poles. For a more in-depth analysis, you can visit [link missing].
These are located closer to the planetary center. At the same time, the uneven mountain ranges do not have the same mass at their highest points as at their lower slopes, nor do the seas have the same consistency. The map of Earth's gravity , which was recently unveiled in Norway, was created using data from the European telescope GOCE. Furthermore, seeing how gravity influences the characteristics of planets could be interesting, so be sure to check it out.
These changes in gravity can help us see lava flows under volcanoes, establish a height system for steep mountain ranges of global significance, reveal how much mass ice sheets lose, or determine the behavior of oceans without tides, winds, or any other kind of movement . Overlaying both sets of data allows us to appreciate the scale of other relevant authorities.
Can you get "0 gravity" on Earth?
As we approach the end of this article, we now address the big question: Is it possible to achieve zero gravity on Earth ? In this case, I would say, according to testimonies from specialists on the subject, that gravity, the force with which a planet attracts a spacecraft, is inversely equal to the square of the distance traveled and, therefore, decreases rapidly as the craft moves away from the planet.
That is, by doubling the path to its center, the affinity is four times smaller (22 times); by doubling it three times, the affinity is nine times smaller (32 times), among other things. However, that is not the reason why space travelers and objects are in a state of lightness. For more information about the first manned spaceflight, visit the first manned spaceflight page.
Astronauts experience weightlessness because they are in freefall near the planet, launched into space with a specific speed and trajectory to achieve orbit . For a better understanding of gravity in space, you can also read about artificial satellites.
You increase the system's speed and the space travelers will drift apart in space; you launch them with less force and they'll eventually fall back to Earth . The same thing happens to someone in an elevator if the cable breaks and they experience no friction between the elevator car and the air or the doors—an impression of weightlessness. So there's nothing more to say about zero gravity on Earth, isn't it? Interesting, isn't it?
