All Questions
119
questions
-6
votes
1
answer
52
views
Why sun revolve around the sun ? Why cant it just rotate ? ( gravitas attraction force makes it revolve , how?) [closed]
Why the revolution ?
How General relativity theory explains it
- 50.2k
1
vote
2
answers
444
views
What is the minimum size of an object to cast a shadow on the entire Earth?
When I fly up(don't ask me how), I see how my Sun's shadow on Earth is getting bigger but dimmer as the Sun's light is reflected from other objects.
As I flew higher and higher in the direction of the ...
- 1
1
vote
3
answers
87
views
The speed of an impulse transmitted along a string
A supernova explosion on the far side of the Sun ejects a mass with approximately the same mass of the Sun directly at the back side of the Sun. If this ejected mass is travelling arbitrarily close to ...
2
votes
2
answers
677
views
Effect of radiation pressure on Earths orbit in large timescales
I have seen some posts concerning the radiation pressure exerted by the Sun on Earths surface (Force on Earth due to Sun's radiation pressure). Though it is fairly small may it have a considerable ...
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
1k
views
Is the orbit of Earth currently decaying?
As we know, interplanetary space is not completely empty. This would cause a drag to Earth, spiralling it towards the sun in a long enough timescale, which appears to be what has happened for many ...
0
votes
0
answers
47
views
Does the Earth's magnetic field lag behind the Earth as Earth orbits the sun?
I imagine that when the earth orbits the sun, the earth's magnetic field is also subject to the sun's gravity, since photons and light are subject to gravity. As a result, the magnetic field does not ...
- 93
0
votes
1
answer
121
views
Which gravitational differences we would feel if the sun disappeared?
I would like to start by stating that I'm not a physicist, I'm purely a curious individual.
I've been speculating about the differences the loss of the sun's gravitational field would have on us and ...
-1
votes
1
answer
81
views
How fast do I have to fly vertically up to pause sunset?
I'm standing on the famous Laguna Beach in southern Los Angeles to watch the sunset on December 18th (33.541679°N 117.777214°W, 0m elevation, 16:44 PST). Now, from my perspective at the shore, the sun'...
- 12.5k
0
votes
1
answer
88
views
How can the distance to the Sun from the Earth be determined without relying on any prior baseline measurements?
I am asking if there is a way that a man could determine the distance from the earth to the sun without already having a baseline distance or dimension measurement to begin with, and without having ...
- 207k
9
votes
1
answer
2k
views
When was today's radar measurement of the Earth-Sun distance made and by who?
I have seen other similar questions and someone mentioned radar measurements made in the 1960's. Who did that and when and where? I am not interested in ancient measurements. Only the currently ...
- 1
-5
votes
1
answer
101
views
Can the four Seasons of planet Earth be defined in terms of Energy? [closed]
Can the four Seasons of planet Earth be defined in terms of Energy?
The definition of Energy gotten from Google is:
ability to do work, which is the ability to exert a force causing displacement of ...
- 11
1
vote
1
answer
97
views
Is Earth's magnetic moment vector oriented parallel or antiparallel to the sun's magnetic moment?
Just curious how these two magnets are spatially related to?
And in case there is no any special preferred particular orientation, what is anyway their spatial orientation relation (relative angles)? ...
- 1,665
3
votes
1
answer
7k
views
What causes the perceived intensity of the sun to change on a short timescale?
I was inspired by this question to ask, what causes the "beating down" feeling of the sun to vary day to day? While the linked post explains why the sun feels hotter in the summer than in the winter, ...
3
votes
1
answer
77
views
Earth is spiraling away from Sun at rate of 1.5cm per year due to mass loss of Sun? How it was calculated? [closed]
My physics teacher asked if we could calculate the rate at which Earth moves away from the Sun due to the mass loss of the Sun. It's very sensible for me to understand that Earth is spiraling away ...
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