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oemBiology oemBiology
wrote...
Posts: 1245
8 years ago Edited: 8 years ago, oem7110
Referring to following image, I would like to know on how and which planet effect the SUN the most in order.
Does anyone have any suggestions?
Thanks in advance for any suggestions


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wrote...
Valued Member
Educator
8 years ago
Generally, the larger (more dense) the planet, the more of a gravitational pull it has.
wrote...
8 years ago
Generally, the larger (more dense) the planet, the more of a gravitational pull it has.

Yes and no. The greater the amount of matter something has, the more gravitational force it will generate. One must also take into account the density of the planet. Density being calculated as mass per unit of volume. So, even a planet slightly bigger than the earth, but the composition of a gaseous planet, like what Neptune is, it would not create more gravity since it was less dense and had less matter in it. It just so happens that the gas giants in our solar system are so enormously larger than earth that they have enough matter to create a stronger gravitational force. But, not what one would think. For example, Jupiter is a few thousand times bigger than earth, but only has just over twice its gravitational force. Why? Because Jupiter is not as dense as earth is. In fact, if you could put another gas giant, Saturn, here on earth and disregard its gravity, it would float on the ocean.

And, you cannot say the "heavier" the planet is, the more gravity it creates. An object's heaviness is a result of the gravity well it is in, it's gravity is a result of its mass which is always constant.
wrote...
Valued Member
Educator
8 years ago Edited: 8 years ago, bio_man
Okay, fine, but Earth is the densest planet in our Solar System. It has a density of 5.51 grams per cubic centimeter. This is only the average density of the planet. The core is much denser than the oceans for example.

Does that mean it has the greatest pull?!

Edit: Found the answer online...

Jupiter is the most massive planet in our Solar System, meaning it also has the highest gravity. If you stood on Jupiter – you cannot because it does not have a solid surface – than you would weigh two and a half times what you would on Earth.

Edit: Maybe not totally right Upwards Arrow

Jupiter, while a "gas planet" still has a solid rock core in addition to solid hydrogen layer.
oemBiology Author
wrote...
8 years ago
Does anyone know the formula to calculate gravitational force between planets and SUN?

Would it be something like F = G x (m1 x m2) / r2?

Does anyone have any suggestions?
Thanks, to everyone very much for any suggestions :>
wrote...
Valued Member
Educator
8 years ago
That's correct, use this formula Downwards Arrow

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oemBiology Author
wrote...
8 years ago
Thanks, to everyone very much for suggestions :>
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