All Questions
119
questions
0
votes
2
answers
113
views
Proof against Tychonian model by view from Space
No earth-based observation of the planets can disprove the Tychonian model (planets orbit sun, which orbits the earth). It takes very fine stellar observations, which couldn't be done in the 17th ...
- 111
3
votes
4
answers
203
views
Does the photons of light have an effect the movement of solar planets
In space, solar sails are used in order to move some space exploration crafts. Since in space there is vacuum the slightest force could be enough to propel and move the craft. Although the earth is ...
- 133
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, ...
- 3,710
1
vote
0
answers
56
views
How much time does it take in Earth to generate the energy supply that the sun produces in one second?
According to this article which I ignore if it's correct The amount of energy the sun emits every second is , the amount of energy the sun emits by second is $4\times10^{33}$ ergs . And according to ...
- 167
-1
votes
2
answers
69
views
Sun-path on the sky [duplicate]
We are standing on the Earth and we see Sun on the sky. We see it walking in a certain direction, with predictable moving. Earth is a spheroid, as we all know. It is circling around the Sun, and also ...
- 119
41
votes
7
answers
9k
views
Why does the full Moon appear?
I know that the full Moon appears when Sun, Moon and Earth are in a straight line, but if we consider that they are in straight line, why is the Moon illuminated?
I mean to say that Earth should ...
- 592
1
vote
0
answers
65
views
For how much energy does the heat generated in earth's interior account in earth's total energy budget? [duplicate]
I imagine the sources of earth's total energy budget to be
The sun
The sun deposits about $\sim 1400 \frac{\mathrm{kW}}{\mathrm{m^2}}$ via radiation on earth$^1$. Eventually, this is the source of ...
- 537
0
votes
1
answer
89
views
Can a perfect Earth-sized lens between the Earth and the sun darken parts of the Earth (so in that parts the sky looks like the night sky)? [closed]
Suppose an Earth-sized (convex) perfect lens is placed between the sun and the Earth (with the center of the lens on the line between the center of the Earth and the center of the sun, and the lens ...
2
votes
2
answers
473
views
If gravity can be disrupted by larger forces, why does the moon orbit the Earth instead of the Sun? [duplicate]
I read an thread on this site about how a larger gravitational pull can overpower a smaller gravitational pull. I took this to mind, and I started wondering why the moon orbits the Earth instead of ...
- 285
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 ...
- 1,223
19
votes
3
answers
5k
views
How can a full moon be seen south of an observer's location?
I know this seems like a simple question, but I'm trying to debate with a flat earth theorist. I asked him to explain why can the ISS visibly be seen orbiting the Earth with the naked eye, and he put ...
- 215
-1
votes
1
answer
40
views
Gravitational effect of larger solar system to Earth orbit
Let's say our solar system enters to gravitational area of a larger solar system. Does Earth's orbit of sun get affected from this case?
- 181
-1
votes
2
answers
510
views
Sun is giving new energy everyday. Then how does this phrase make any sense: "Energy is never created nor destroyed, only transformed"? [duplicate]
If sun is the source of energy on earth, then this means that the sun is providing new energy everyday. Then how does this phrase does make any sense: "Energy is never created nor destroyed, only ...
- 115
1
vote
0
answers
25
views
What are ShadowBands during SolarEclipse and how can it be reproduced?
I recently got to know about different phases of a solar eclipse and its impact on Earth and its living creatures.., but one of the most interesting and not well explained phenomenon is the ...
- 11
37
votes
6
answers
12k
views
If the moon had a mirror surface, would the earth be equally illuminated as by the sun during full moon, or would it require a different mirror shape?
Suppose the apparent diameters of the sun and the moon are exactly the same (which in fact very close to the real situation). If the moon had a perfect mirror surface, would the reflected visible ...