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Articles 20-23

The Second Action of Air-Aether: Gravity

by Rene Descartes Icon
3 minutes  • 463 words
Table of contents

20. The second effect: gravity

The motion of the air-aether that makes droplets round also makes planets round.

In Cartesian Physics, surface tension and gravity have the same cause. The parts of a droplet go towards its center just as a planet's parts go to its own center.

This phenomenon is the gravity of terrestrial bodies.

  • This is caused by these globules moving indiscriminately in all directions.
  • This makes them uniformly press all particles of the Earth towards its center, making the Earth round.
  • This pressing motion is impeded by the resistance of the Earth’s mass.
    • This in turn pushes all the Earth’s particles towards the center.

21. All earth-aether particles, if considered alone, are light, not heavy

A vacuum contains nothing that can impede or assist the motions of other bodies.

If we imagine that:

  • all the spaces around the Earth became void
  • the Earth rotates around its axis with its own motion

Then:

  • all the Earth’s particles which not very firmly connected to each other would leap towards the sky from time to time
    • This is the same as how sand thrown in a whirlwind immediately disperses in all directions.
  • the Earth would be considered light, not heavy.

22. Where Does the Lightness of the Air-Aether Come From?

In reality:

  • there is no vacuum
  • the Earth is rotated by the surrounding air-aether that permeates it entirely

The air-aether has no force of heaviness or lightness as long as it totally agrees in the motion that carries the Earth.

Zero G
The pushing force of gravity is negated by an airplane falling faster than that push. In Descartes-speak this is when it ’totally agrees in the motion that carries the Earth'

But in reality, they are hindered from their straight-line paths by their impact with the Earth.

23. How all parts of the earth are pushed downwards by the air-aether to become heavy

All the spaces around the Earth are occupied either by:

  • the air-aether as space
  • the earth-aether as physical air

The air-aether has a force that causes it to move away from the Earth.

This can only exert its effect when, during its ascent, it depresses and propels some terrestrial parts below itself into the space that it just left.

The air-aether globules all have equal power. None of them can displace the other.

But terrestrial bodies have a lesser content of air-aether. This creates an inequality among the air-aether.

Thus the gravity of each terrestrial body is not produced by the air-aether surrounding it.

Instead, it is produced only by those that immediately ascend in its place when the body descends. Therefore, they are exactly equal in magnitude to it.

For example, B is a rock in the middle of the air. It naturally has more earth-aether content than air-aether.

Earth

If rock B descends towards I, it will displace an amount of air-aether that will rise into its place.

This air-aether above it has the force to further depress that body.

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