Why Moon is Not Attracted By Earth?
Since we were born and were able to recognize things, we have seen the moon in our night sky. Getting into new shapes now and then, but it doesn't move from its place. Sometimes it does go away for 2 nights, but it comebacks again. So one question lurks from behind our heads when we were kids and look at the moon at night.
Why doesn't the moon fall on Earth? What kind of magic is holding it there in the sky, when all the things that we see are stuck to the ground and take a lot of energy and force to put something in the air. Then how does such a massive object like the moon stay in the sky for so long without having any engine?
As a child, even we used to think it was some magic, but we hate to break it to you, that's not magic, it's science. This is relatively close to magic, and today, we are going to talk about how the moon is not attracted by Earth and how we are safe from getting hit by moon anytime soon.
Instead of asking why the moon doesn't fall on Earth, you need to question Why the moon is not attracted by Earth? This is a better way to put words to this question. The gravitational force between Earth and the moon is strong. But the force is not strong enough to pull the moon towards us, like an apple falling from the tree due to Gravity.
What Keeps the Moon in Orbit Around the Earth?
From Earth, it might look like the moon is stationary, meaning it is not moving, but in reality, each year the moon gets 3 cm away from Earth. Without having the force of Gravity from earth-moon would have just floated away from us. The moon's velocity and distance from Earth allow it to make a perfect balance between fall and escape.
In case the velocity of rotation of the moon was a little bit faster, it would have escaped the Earth's Gravity. On the other hand, if it's a little bit slower, it would have fallen on Earth. That's why the moon doesn't fall on Earth.
What Happens if Earth Doesn't Have Gravity?
We have told you about how Gravity depends on the distance too. You might have seen Astronauts in the space they are floating inside the space station and when they are doing the spacewalk. That's a clear example of humans able to escape the Gravity of Earth. It does take a lot of energy to leave the Earth's atmosphere and then go to space. But once you are in space, no force is holding you back from flying like a Superman.
On the other hand, there is a downside of not having any Gravity. If on Earth we don't have Gravity, the Earth won't be present in the first place. The big chunks of it will break and float away in the space. In addition to this, if somehow Earth managed to keep itself together still, there will be no water and atmosphere on the surface of the Earth, and thus, no living organism will be able to survive such a harsh environment.
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Furthermore, if we were somehow able to live on Earth, our bodies will have no shape, meaning the body structure that you see right now in all animals will not be present. Yes, you will be like Jelly, and your bones and organs will move inside your skin from place to place. We are sure nobody wants to have that kind of experience.
To keep their muscles intact, astronauts in space take more than 3 hours of daily exercise routine. Even after all this exercise, astronauts still need rehabilitation to get back on their feet to move around freely. One more thing we would like to tell you, with massive Gravity comes time travel. Yes, we are not joking here. A Russian cosmonaut named Sergei Krikalev spent 803 days on a space station revolving around the Earth. The gravity pull on the space station was less compared to the pull that we have on Earth. As a result, Krikalev lived 0.02 seconds less than everyone on Earth.
This is the only way we can time travel right now. If an object is big and has a massive gravitational pull, then time around that object will slow down. This was also depicted in Interstellar, a Sci-fi movie by Cristopher Nolan, who showcased how time affects a person when they get close to Blackhole.
1. Why Does the Moon Revolve Around the Earth?
First, many astronomers believe Earth and moon are dual planet systems because both the plane of the moon and the Earth are quite familiar. The moon is present in the space's vacuum, so no force is working towards stopping it from moving around the Earth. It revolves around the Earth due to the gravitational force, which doesn't allow the moon to float away in space.
2. Why Do We Only See One Side of the Moon All the Time?
For the moon to complete its one rotation around the Earth, it takes 27.3 days, and it completes its one spin around its axis at the same time i.e., 27.3 days. As a result, even though the moon is spinning around its axis, we were able to see the only side of it, and the other is hidden in the dark.