Questions tagged [the-sun]
Questions regarding the closest star to Earth, at the centre of the Solar System.
574
questions
2
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Are Sun-Earth L1 & L2 points generally considered outside the Earth's Hill Sphere?
This image from Wikipedia of the SE Lagrange points and the Hill Spheres suggests that the SEL points are outside the Earth's Hill Sphere. (The Hill spheres are the circular regions surrounding the ...
1
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1answer
66 views
Are there celestial bodies that are about as far away as the Sun?
Just curious. The Sun is 500 light seconds away from the Earth depending on time of the year. The orbit of Mars is about 50% as far as the Sun, the orbit of Vesta about 150%. Is there / Are there ...
0
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1answer
61 views
How is the Sun tilted to its orbit around the Milky Way's center?
We know how the Sun is tilted in reference to its planets but how is it tilted to Sagittarius A or its orbit around it? Or isn't it tilted at all?
4
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1answer
130 views
How much more life could the Sun acquire via star lifting?
It has been proposed before that we could use this technique to remove hydrogen from the Sun to lower it's rate of fusion and extend it's life, so it doesn't fry our planet.
I am wondering how much ...
20
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1answer
8k views
Why isn't the asteroid belt affected by Jupiter's gravitational field?
Jupiter's mass is just about a 1000th of the sun's and the asteroid belt is slightly closer to Jupiter than it is to the sun.
If the heavier the object, the more curvy space is around it, why isn't ...
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68 views
Could the Sun's planetary nebula be dangerous for the planets?
Since the Sun's mass isn't high enough it won't go supernova being a red giant but instead release a planetary nebula. So that seems to be kind of a substitute for a supernova. Would ejecting the ...
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0answers
23 views
How do I calculate moon phase orientation at any Coordinates given all the necessary data?
I'm having a problem for a couple of days where I'm trying to accurately calculate the phase angle of the moon at any given Coordinates (lon,lat).If I know my current Coordinates, Moon and sun ...
3
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0answers
44 views
What is happening with these solar particles detected near the Sun that is so newsworthy?
Phys.org's Team identifies low-energy solar particles from beyond Earth near the Sun links to the open access ApJ article Properties of Suprathermal-through-energetic He Ions Associated with Stream ...
5
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1answer
945 views
What does the Sun look like from Eris at its aphelion?
At its aphelion (most distant location from the Sun) the outermost-known planet Eris is about 100 times as far from the Sun as Earth. What does the Sun look like from Eris' surface? Is there still a ...
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1answer
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What does this “web on the surface of the Sun” image reflect? What does 789 nm show us?
What is this web on the surface of the Sun? has got me thinking.
This is probably not a normal color photo.
The cooler areas are really dark!
update: Comments point out
The NSO press release says ...
30
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3answers
5k views
What is this web on the surface of the Sun?
I was going through my Social Media Feed and found the attached post too frequent. The caption reads this is the best image of our Sun. Just as an example, the Universe Today's This is the Highest ...
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1answer
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Was the Sun's gravitational lensing observed in other solar eclipses than the one in 1919?
In 1919 the gravitational lensing by the Sun has been observed during a total solar eclipse. Did someone observe the lensing in any other total eclipses? Last year there was a total eclipse in Chile ...
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3answers
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Do we know a star that is similar to the Sun when it would be a red giant?
In about 5 billion years the Sun is predicted to become a red giant and have more than 200 times its current size, reaching a radius of about 5 AU when largest.
I wonder what spectral class the Sun ...
4
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2answers
91 views
Moonrise after sunrise but moonset before sunset?
Today (1/24/2020) for Boston MA timeanddate.com lists the following four times:
Sunrise 7:05 AM
Moonrise 7:06 AM
Moonset <...
2
votes
1answer
186 views
Why we can't see our Sun as it was a few years ago?
Our Sun is orbiting the center of the Milky Way galaxy. So many years ago, it was at a different location from where it is now.
In addition, we are observing stars and exoplanets as they were many ...
2
votes
1answer
72 views
What is the exact time of sun stay in each zodiac every year on sidereal year duration?
I tried to reverse engineer from astro-chart times at which sun stays in a zodiac.
Here is the list.
...
0
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0answers
26 views
The sun networks [duplicate]
For my research about the sun activity I need to edit pictures of the sun. I want the pictures to show three stages the quiet, enhanced and active/plage network. I couldn't find any information in the ...
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1answer
30 views
Difference between quiet, enhanced and active networks
For my research about the sun activity I need to process pictures of the sun. I want the pictures to show 3 stages the quiet, enhanced and active network. I couldn't find any information in the ...
6
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1answer
89 views
Is there a verification of the solar system barycenter as it is theoretically determined?
The barycenter of our solar system is not the sun, but a changeable location outside of the center point of the sun. A often used diagram of that relation is shown below, originated from the Wikipedia ...
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0answers
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X-rays, Solar wind and Sun's corona
I was reading that Solar corona emits the solar wind however also X-rays. What is the difference during the creation of these effects and impacts on our atmosphere?
Thank you!
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0answers
28 views
Calculating angle between the sun and a perpendicular to earth given lon/lat & time
If you had your longitude/latitude, and the time/date, how could I go about working out the angle between your normal and the sun?
At first I was doing a simplistic approach of assuming elliptical ...
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0answers
38 views
Astronomical events and Celebrations
In the past people celebrated important astronomical events and some of those events are still celebrated in some cultures and traditions.
For example: March/September equinox, New Moon, Winter/...
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0answers
30 views
Stellar interior structures
im really confused on how i relate mass to radius of a star with a non constant density. more specifically i cannot seem to find an equation that states how density varies throughout a main sequence ...
2
votes
1answer
42 views
Does Earth's magnetic field become stronger when a solar flare hits?
This curiosity arises as follows: when ejecta from a strong solar flare hits Earth, will the Earth somehow counter its impact with a stronger magnetic field.
Or, earth's magnetic field as limited ...
3
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0answers
37 views
Why do CME's “zig-zag” on their way to Earth?
This answer states:
A single CME will impact a spacecraft from only one direction, but that direction might not be directly from the sun because a CME may zigzag en route.
Looking at that link, ...
2
votes
1answer
86 views
Latitude of given altitude of Sun
From Question #6 of USAAAO First Round 2018
(1 point) For the following problem find the range in which the answer lies: on the day of summer solstice, on which geographic latitude is the sun ...
2
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1answer
145 views
Why do the magnetic field lines of the earth go from south pole to north pole?
I saw these figures and could not get why the magnetic field lines are not pointing from the north pole towards the south pole but they do the opposite.
Or also this picture which is about magnetic ...
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1answer
84 views
Sun and moon's orbit in ecliptic coordinates using skyfield
I am new to using skyfield, is there any doc or help file that can show me on how to get the orbit of Sun and moon in ecliptic coordinate for a particular date and ...
0
votes
0answers
80 views
how is it possible to see the sun and the moon at the same time? [duplicate]
I once saw the sun and the moon at the same time once. How is this possible?
Im from london england U.K and this probably some time in 2017 autumn time at around 6pm any Ideas.
2
votes
2answers
128 views
Is the sun flipped on the other side of the world?
As the orientation of the moon is different in the northern and the southern hemisphere, is the orientation of the sun different in both hemisphere?
Does a sunspot appearing in the Sun northern ...
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vote
2answers
67 views
Can I use the Tokyo Skytree as clock?
After my observation today at the Skytree in Tokyo, I am wondering if this building could be used as a giant sundial?
As an aside, it would be interesting to consider how the Skytree might be used ...
44
votes
2answers
4k views
Does the sun cross other spiral arms in its movement around the galaxy's center?
Today, Ansa.it released an article that states:
[...]. In questo suo peregrinare galattico, il Sole ha attraversato anche
i due bracci della Via Lattea Perseo e Centauro. "Sono zone di alta
...
2
votes
1answer
54 views
How much does the stellar radius change if seen through different filters?
I know that the radius of a star should be different depending on the filter being used to do the observation. That is, the bluer the filter, the smaller the measured stellar radius. I know this ...
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votes
1answer
93 views
Solar degrees vs Calendar days [closed]
What is the difference between solar degrees and Calendar days. Is there any formula to convert one to another.
for example Starting from 1/1/2000
1/1/2000 + 300 calendar days=some date (easy)
1/...
5
votes
2answers
360 views
Why does the Solar Wind consist of charged particles?
The Wikipedia article on Solar Wind gives the following explanation:
The solar wind is a stream of charged particles released from the upper atmosphere of the Sun, called the corona. This plasma ...
4
votes
0answers
44 views
Simulate earth, moon, sun constellation with dates
I would like to simulate the three object distance, specifically the distance of the moon to both, sun and earth for further investigation into tide prediction.
What would be a good starting point ...
6
votes
1answer
175 views
A vertical stick's shadow at solar noon should be straight north/south, right?
At true solar noon, the subsolar point should be directly north or south of you, and therefore a vertical stick's shadow should point directly north or south, right?
The Wikipedia page for Sun Path ...
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vote
1answer
136 views
What would we notice if the Sun stopped fusing atoms? [duplicate]
(This question was stimulated by Would we have more than 8 minutes of light, if the sun "went out"?)
According to this answer, the "Sun has enough gravitational potential energy to supply ...
55
votes
2answers
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Would we have more than 8 minutes of light, if the sun “went out”?
The common theory is, that if the Sun "shut down", we would see the light for eight more minutes (the time that it takes the photons to reach the Earth).
However recently I have read that photons ...
19
votes
4answers
8k views
Would an object shot from earth fall into the sun?
Would an object shot from earth fall into the sun?
If an object is shot at 107,000 km/h via rocket or otherwise, in the opposite direction to our orbit about the sun, it will be traveling at 0 km/h ...
5
votes
1answer
352 views
Is the resulting light from a supernova a product of photons bouncing around in the Sun?
I was thinking about how photons formed in the centre of the Sun take quite a long time to exit the surface. And it occurred to me that at the end of a star's life (during a supernova, given that it's ...
3
votes
0answers
62 views
Does the Sun have a numerical designation in any star catalogues?
Given the existence of large star catalogues listing millions of astronomical objects with numerical designations (such as Tabby's Star, KIC 8462852) it occurred to me that one of them might contain ...
5
votes
1answer
65 views
What is the intensity distribution of visible light over the solar disk?
What is the distribution of the visible spectrum over the solar disk?
Images of the Sun using the visible spectrum suggest that the light emmitted from the edge is almost equal to the light emmited ...
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0answers
29 views
Angle of the Sun during winter solstice
What is the angle of the Sun on the eastern horizon at 35° latitude if it is the winter solstice?
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2answers
60 views
What parameters cause sunburn? [closed]
I am new to this site so if the question doesn't fit in this forum feel free to remove it.
I have read here https://en.wikipedia.org/wiki/Sunburn of all the causes of sunburn and I was mostly aware ...
3
votes
1answer
109 views
Any simple experiment with an H-alpha telescope?
Is there any simple experiment that can be done with an H-alpha telescope, for example to estimate the Sun's mass, size, distance, temperature or intensity?
I give lessons about renewable energy and ...
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0answers
51 views
Is there any possibility that a gas planet turns into a star [duplicate]
Since the sun is made of one of elements hydrogen
Why Saturn and jupiter doesnt turn into a star since they have a elements of hydrogen ?
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0answers
117 views
How big a rock can hit the sun and it not matter? [duplicate]
If a rock the size of Oumuamua were to crash into the sun — assume central collision — would it materially affect the sun’s behaviour? Would unaided humans (rather than sun-tastic special telescopes) ...
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2answers
107 views
Does the magnetic field of earth restore?
The magnetic field of earth protects us from solar wind as we know it, but after the solar wind interacts our magnetic field.
Does the magnetic field of earth restore after it deflects the solar ...
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1answer
42 views
Maxwell stress contribution to $\nabla \cdot \mathbf{P}$ in the Navier-Stokes equation for fluid in stars
I was reading through the following extract outlining how the Maxwell stress contributes to the $\nabla \cdot \mathbf{P}$ term of the Navier-Stokes equation for fluids in a star. Here $\mathbf{P}$ is ...
