All Questions
90
questions
4
votes
1
answer
164
views
Would the Moon move away if the Earth were frozen with no liquid tide?
The moon is moving further from the Earth. To the extent that after 600 million years we will no longer enjoy full solar eclipses as it will be too far away to completely block the sun.
The reason the ...
- 41.2k
0
votes
1
answer
5k
views
Moon vs Sun size and distance 400 times
I have seen below statement, and it doesn't sound right:
The Sun and Moon seem to have the same size because of this amazing coincidence:
the moon is 400 times smaller than the Sun and 400 closer ...
0
votes
1
answer
78
views
What happened to Newton 3rd law if our Moon is moving away at 1.5" yearly? [closed]
Our Moon is going away and I read that it is the culprit is our ocean, but then what happens to Newton 3rd law there should be an equal and opposite forces too so where's that? Is it absorbed by the ...
- 1,143
20
votes
1
answer
2k
views
If the tidal bulge on the earth speeds the moon up, how does the moon move to a higher orbit?
I understand that the moon causes a tidal bulge on Earth, and this tidal bulge moves slightly ahead of the moon due to Earth's rotation.
When reading about why the moon is moving away from the Earth, ...
- 207k
1
vote
2
answers
136
views
Will the moon ever proceed to lose its orbit and hit the earth?
Assume that the moon it orbiting the earth in a circular trajectory.
It will experience an acceleration directed towards the centre of the earth given by $\frac{GM}{R^2}$ where $G$ is the universal ...
- 2,352
0
votes
1
answer
70
views
Has anyone experimented with simulating moon lighting?
Has anyone (in general) experimented with simulating moon lighting?
It means the following. A gray ball is illuminated with light with a brightness equal to that of the sun.
And at the corresponding ...
- 41.1k
1
vote
2
answers
269
views
Moon and the moving train
While travelling by train (travelling West to East), it seems the moon is moving in opposite direction when seen from the window, but then it reverses its direction, after a certain amount of time and ...
1
vote
3
answers
193
views
Which parts of the electromagnetic spectrum cannot be used for remote sensing of the Earth system and why? Is that different on the moon? Why?
Which parts of the electromagnetic spectrum cannot be used for remote sensing of the Earth system and why? Is that different on the moon and if yes, why?
- 35.4k
7
votes
1
answer
671
views
How exactly does the Moon stabilizes Earth axial tilt?
There are many references regarding the Moon stabilizing the tilt of the Earth's rotational axis. I'd like to see some support for that claim, more than non-sequitur handwaving "Moon causes tides,...
- 21.4k
1
vote
0
answers
65
views
The radius of Earth is 4 times the radius of the moon. Estimate the acceleration due to gravity on the surface of the moon [closed]
I have derived an expression here which just needs the ratio of the densities of the Earth and its moon. My question is how do I go about finding this ratio or is there another way to approach this ...
1
vote
0
answers
22
views
Centre of Gravity of Earth-Moon Elevator [closed]
Suppose you have a cylindrical elevator that resembles a rod of mass $m$, cross-sectional area $A$ and uniform density $\rho$, with a length $L$ spanning the distance between the Earth and the Moon. ...
- 207k
5
votes
1
answer
2k
views
If the Moon had gravity as strong as the Earth's, and a magnetic field, could it have supported life?
If the Moon had gravity as strong as Earth's, and a magnetic field, could it have supported life? Because if the Moon had as much gravity as Earth, it could have retained more water than is present ...
0
votes
1
answer
52
views
Why is the time difference of equal tide states not 50 minute if one lunar day is 24 hour and 50 minutes?
I do understand that tidal forces are caused by de difference of gravitational force between both opposite points of the earth where a bulge is formed.
I do understand that a lunar day is ruffle 24 ...
- 207k
0
votes
1
answer
60
views
If the Earth and the Moon were smaller, would moon tides be more or less intense?
If the Earth and Moon were smaller (and everything on them too, but keeping the same average density and the same "relative" distances, I mean... the same proportions!), would the tides ...
- 34
0
votes
1
answer
127
views
How does the moon affect the position of zero gravity in the Earth?
I am interested in the position of the point of zero gravity within the Earth as a function of the gravity of the moon. Take the example of the moonless Earth. The position of zero gravity would be ...
rob♦
- 91.5k