All Questions
10
questions
0
votes
2
answers
82
views
Why are planets denser as you approach the center?
Gauss' law says that the net electric force inside a hollow, uniform, not rotating sphere is zero. Since gravity is also proportional to the inverse square of the distance, I assume this should apply ...
- 533
0
votes
0
answers
44
views
Gravity formula inside a planetary core
I am trying to work through this problem so that I can understand how to convert from pressure values to radius values inside a planetary core in a code. The core has variable density depending on ...
2
votes
2
answers
285
views
What's the minimum possible size of a round astronomical body?
What's the minimum possible size of a spherical shaped rocky planet or satellite? Is it possible to occur a spherical shaped planet without having a molten core?
0
votes
1
answer
45
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Doubt regarding elliptical orbits and eccentricity relation with masses
I was working with Roche's Limit , You can visit the wikipedia page on Roche's Limit and Hill's Sphere (not important here). A query raised in my mind about the elliptical orbit in which the moon is ...
- 19
2
votes
2
answers
2k
views
What are the gravitational binding energies of giant planets?
What are the gravitational binding energies of the planets in our solar system? In particular, interested in the giant planets: Jupiter, Saturn, Uranus, and Neptune. Ideally the information would be ...
- 756
2
votes
1
answer
89
views
Nice model of Solar system: Does gravity produce larger distance between objects? [closed]
Counter intuitive it seems that in some cases gravity results in a higher orbit and greater distance. For example the moon is attracted to the Earth but because it gets a higher speed it ends up ...
- 3,348
6
votes
3
answers
2k
views
What keeps a gas giant from falling in on itself?
There is not enough gravity at the center to start nuclear fusion, but it seems that there would be plenty enough to collapse the planet.
- 227
4
votes
2
answers
5k
views
How does one measure Earth's speed of revolution around the sun?
I know that there are several formulae that one can plug numbers into to arrive an estimate of Earth's speed around the sun (Kepler's third law for instance), but I'm wondering how these things are ...
- 3,727
3
votes
1
answer
252
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What is the maximum mass of planet HD 40307 g
Recently discovered planet HD 40307g around HD40307 Star system is claiming that its inside a habitual zone of a solar system. Besides It has water where life could be evolved.
I tried to calculate ...
- 133
22
votes
3
answers
7k
views
Gravity on a doughnut-shaped/Möbius planet
How different would the effects of gravity be if the planet we're on is in the shape of a torus (doughnut-shaped)?
For an (approximately) spherical planet, it's slightly clear that objects would tend ...
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