Is the size of the Earth set in stone? Can we change its size? Let's start an interesting thought experiment: suppose we are in another parallel world, where everything is the same as the original world, except that the size of the object can be changed arbitrarily. So, if the size of the earth changed, how would our lives change?

It has been suggested that if the earth were to double in size, the land area would also increase, and people might be able to build wider neighborhoods and dwellings, thus bidding farewell to the congestion and crampedness of modern cities. It may sound like a good idea, but is it really as rosy as we imagined?

In fact, as the diameter of the earth doubles, the gravitational force generated by it will also increase dramatically, and it will be very challenging for humans to survive in a stronger gravity environment! At that time, people will have to work hard to make any movement, and their legs will seem to be filled with lead when they walk; At the same time, because the heart needs to overcome gravity and pump blood to supply the brain, humans are likely to grow shorter and heavier than they are now, and even have to lie down for the rest of their lives!

As far as the Moon is concerned, it will be pulled into a new orbit very close to the Earth, and the Moon's influence on the Earth's tides will also change dramatically, and the waves caused by the tides will sweep the world, and many coastal cities and islands will be hit by the waves and will no longer be habitable!

As the Earth's gravitational pull increases, the atmosphere will get closer to the surface and the density of oxygen will increase. With each inhalation, more oxygen molecules are inhaled. This may sound like a good thing, but the chemical nature of oxygen is relatively active, the human body can only cope with a certain amount of oxygen, and too much intake can cause epilepsy and breathing problems, and in severe cases, it may lead to coma or death!

So, what would happen if the Earth shrank?

When the density of the Earth remains the same and its diameter is reduced by half, its gravity is also halved. Less gravity means people can jump higher and fall slower. In martial arts dramas, the scenes of heroes flying on the wall and floating on the water may become a reality.

It may sound like a good thing, but when the Earth shrinks, it will be easier for us to do things. However, the shrinking land area of the earth will also be reduced, and human beings will face a serious problem of land resource scarcity.

If the Earth becomes smaller, its traction on the Moon will weaken due to the increasing distance, and the Moon will most likely gradually move away from the Earth or even disappear altogether. Once we lose the moon, we face more than just the darkness of the night.

Without the Moon, the Earth's axis of rotation will become unstable, the poles will not always be cold as they are now, the equatorial regions will not always be warm, the Earth will not have a long-term stable climate, and the Ice Age will sweep the world in a cycle of thousands of years!

It can be seen that if the earth becomes bigger, it will not bring us a more spacious and comfortable living environment; Getting smaller, the Earth can't become a realistic version of a "mini" home. The current size of the earth is just right for us, it can have a stable earth-moon system, regular changes of the four seasons, and a nature that can give birth to life, which is our beautiful home!