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Results tagged with gravity
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user 34155
Questions regarding the attractive force which exists between any two bodies of matter.
4
votes
2
answers
270
views
What is 'surface acceleration' of a planet or other body? As opposed to its 'g' (gravity)?
The Mars Fact Sheet at NASA (their NSSDC or NSSDCA section, whatever that means) lists a value for 'surface acceleration' just below one for 'surface gravity'. … The values for surface acceleration are very similar to those for gravity, just slightly smaller... …
- 5,585
1
vote
0
answers
36
views
Does the Schwarzschild metric solution require two (A and B, or g11 and g44) or four compone...
Different places on the web imply that Schwarzschild's metric uses four components or separate equations, similar to how Einstein's full set requires 6 or 10, or they say only two are needed. Is it 2 …
- 5,585
7
votes
1
answer
149
views
What exactly is a 'gravastar'? How is it different from a 'regular' black hole?
The Wikipedia article on gravastar says that it has a 'regular' black hole metric (Schwarzschild, I presume?) on the outside, but a de Sitter metric on the inside....
What exactly does that mean?
Don' …
- 5,585
1
vote
0
answers
52
views
Why does Titan's (relatively) rapid migration away from Saturn cause the planet to wobble fa...
Over the past year and a half, multiple articles in the popular press have come out talking about how unexpectedly rapidly Titan is moving away from Saturn, and how this is causing Saturn to wobble mo …
- 5,585
1
vote
1
answer
183
views
Do Einstein's ten field equations use 20 or 40 variables? (2 or 4 for each tensor equation?)
One site I came across says Einstein's 10 Field Equations use 20 variables, while another said 40.
There are four variables in spacetime - three for space and one for time, right?
But there are two in …
- 5,585
2
votes
In 'Modified gravity' theories like MOND, are galaxies and stars actually, slowly accelerati...
As @PeterErwin's comment compassionately points out:
"Acceleration" means changing the velocity vector, so an object in a circular orbit is always "accelerating" (because the direction of the velocit …
- 5,585
10
votes
1
answer
3k
views
Why is the L1 point (Lagrange) almost 1 million miles from Earth? Shouldn't it be closer to us?
Try to follow my simple logic:
The Sun is almost exactly 333,000 times as massive as Earth, and gravitational strength increases linearly with mass, so the Sun's gravity is about 333,000 times ours. …
- 5,585
4
votes
1
answer
192
views
Could the universe expand forever even if there is no force (e.g., dark energy or eternal in...
All theories of gravity claim it has infinite reach, correct?
I am deeply confused.... …
- 5,585
1
vote
0
answers
58
views
Are short-period comets more stable (in their orbits) than long-period ones?
Why the sharp distinction between short-period (P) comets of less-than-200-year orbits and those (C) with even slightly longer ones?
To explore the possibility that it has to do with stability, I will …
- 5,585
2
votes
1
answer
89
views
In 'Modified gravity' theories like MOND, are galaxies and stars actually, slowly accelerati...
In the Modified Theory of Newtonian Gravity or MOND, they say that massive objects, accelerating slowly, experience this modified gravity. …
- 5,585
0
votes
1
answer
128
views
Why do planets' orbital velocities drop off by less than a third when twice as distant from ...
Looking at the speeds of the planets in our solar system when traveling around the sun and their distances from it (or, using Kepler's third law,), it seems that when a planets distance is doubled, it …
- 5,585