Sun Definition and 1000 Threads

Hey guys, I have a question. I am doing some homework for university and got super confused (probably just messing up things). So in school you learn that magnetic monopols do not exist. But my question is now: On the sun there are coronal holes, region where the magnetic field is not able to...

Why does the Earth not fall into the sun? Is it because Earth has angular momentum? or is it because the Earth has orbital momentum?

Today i woke up not so early around 8am, i get up and cooked breakfast and eat and had to drive for an hour to drop resume to get a job hehe..and went to a park for a walk to smell fresh air for about an half an hour. I get home about 1130am and i went to my basement to do some laundry, i put...

Homework Statement Light from the sun reaches Earth in 8.3 min. How far is the Earth from the sun? The velocity of light is 3 × 10^8 m/s. Answer in units of m. Homework EquationsThe Attempt at a Solution 8.3 min = 498 sec 3e8 x 498 = 1.494e11 m

From the north pole, how high is the sun @ midnight on the summer solstice ? Thanks

Moths do get attracted to artificial lights but the do not all go toward sun as sun also produces enormous light. So they would have gone toward sun.. And why do they get attracted toward lights...

I know that the sun is a gas, but like the earth, no matter how hot the core, the enormous weight would turn it to a solid. So the suns core is a solid and would it spin on an axis? Or just randomly?

Dear PF Forum, I know that this question is purely speculative. And I should have googled it, but... In James Bond film, "Day Another Day", we saw that the villain, portrayed by Toby Stephens tries (and I might say, succeeds) to tranfer energy from the sun to some spot on earth, whether it can...

I know this is speculation but, if the inner solar system was permeated by a gas which could transmit sound waves (say for simplicity, similar to air), would we hear the Sun burning? And which kind of sound would it be? Which timbre and range of frequencies? Would it be unbearably loud? Or very...

I know that Earth orbits the sun because it has initial momentum and that prevents it from falling into the sun. But does moon that orbits the Earth also have initial momentum?

So, I heard the other day from someone online who claimed that if the sun would to suddenly disappear that the Earth would still travel in its regular path for 8 minutes before breaking off. The person claimed that because it takes light 8 minutes to reach Earth, and that since nothing can...

Do photon emissions increase the gravity of the Sun by compressing it

Dear friends, I'm currently living at the equator. Here, homes that have primarily east facing windows are hotter than north or south facing houses, but still bearable. However, homes that are west facing are almost inhospitably hot unless some kind of air conditioning is used. As far as I...

Homework Statement a comet is orbiting around the Sun in a parabolic orbit . center of the sun to perigee of the comet's orbit distance is 58 km . find the time required for the comet to transit into the Earth orbit around the sun . Homework Equations The Attempt at a Solution no clue

Homework Statement given: the speed at perihelion What is comets full energy? What is its distance from Sun at perihelion? How much time is the comet located inside Earth's orbit? Homework Equations parabolic orbit equation 3. The attempt at a solutin wrongly calculated l

These are questions I've made up to try and wrap my head around the topic, so the theory within the questions themselves might be flawed. 1. Homework Statement There are a number of metal sheets that are similar in every way except they each have slightly different masses. The temperature of...

Hi there, I hope this is the right place for this question and furthermore doesn't appear rude that my first post is a question! If so, I do apologise, I haven't been able to find an appropriate place to ask this. I'm working on calculating the position of the sun at a given day of the year for...

How much smaller does the sun appear because of it's gravitational field ? This illustration shows EM waves being bent by the gravitational well of the sun. The light from the sun itself will also be bent by its gravitational well, making the sun appear smaller , ( and have barrel...

How can I prove to my 9 year old daughter that the moon is closer to Earth than the sun? At the moment, she has read it in books and this information has the same status as unicorns and fairy princesses!

Homework Statement Find the surface temperature of a small planet having circular orbit around the sun with time period T,assuming sun and planet to be black bodies. Take radius of sun = R, its mass = M and its surface temperature as ##\theta_0##. Homework Equations ##P=eA\sigma T^4## Total...

I understand that white objects 'reflect' all frequencies of visible light, and black objects 'absorb' all frequencies of visible light. But I thought that 'reflecting' light means that the electrons in the atoms are caused to oscillate, and 'absorbing' means the electrons in the atoms are not...

Hello. I want to know the full in-detail process which happends inside our Sun's thermo-nuclear core. As far as I know the steps in the H - He fusion process are: 1) H+H -> He2 2) He2 can rarely decay (Beta plus) into Deterium and a positron 3) If so Deterium + H -> He3 4) He3 + He3 -> He4 + 2H...

Homework Statement There is no given data.the instruction ask to write ab essay about this topic.what will be find in the center? Homework EquationsThe Attempt at a Solution I read about sun.in the core there is fusion.neutrinos...etc.but i don't have a full idea.thanks for your helps.

If two polarizers are placed 90 degree rotated to each other, we won't be able to see anything. But when I tried looking directly at sun, which I did only for a second, with that perpendicular pair of polarizers, I was still able to see the sun. Shouldn't the sun disappear too ? Or why is it...

What will happen if our sun color blue?

which stage of the sun consists neutron star/stars

Homework Statement the sun collapses to the size of the Earth (approximately 1/100 the original diameter), The current average rotation of the sun is approximately 30 days. Homework Equations what would be the new rotational period (time to spin once)? The Attempt at a Solution I know that in...

I’ve read that the light we can see coming from the sun originates from the suns photosphere which can be modeled as a black body emitter with a temperature of 5760 K. If I use Wien’s displacement law with this temperature to find out where the peak wavelength is: Peak = (2.8977*10^-3)/5760 =...

1. Asking because the answer I got seems too simple...a planet of mass m moves in an elliptical orbit about the sun. The minimum and maximum distances of the planet from the sun are called the perihelion and aphelion respectively. If the speed of the planet at p is vp, what is its speed at a...

Homework Statement Hi everybody, I am trying to do a numerical aplication of change of coordinate system to another; the objective is to calculate the azimut of the sun knowing the altitude, hour angle and declination . Homework Equations Cosh * Sina = Cosδ * Sin H where a is the azimut h is...

My apologies for starting a thread on a seemingly easy and searchable topic. But, alas, I've searched here, Amazon, google, Goodreads etc and wanted to get some recommendations. Specifically book suggestions on The Sun and / or Stellar evolution. I've ran across several intriguing textbooks...

The sun radiates its energy in all directions by emitting photons. As the photons travel as electromagnetic waves it reaches the earth. The photons collide with atoms and molecules in the atmosphere due the collision the energy of photons are emitted as heat. The atmosphere is thus heated and it...

Hi guys, I'm currently doing a little project an I need to calculate the speed of a satellite around the sun! I'm currently trying with the Earth, but i have some problem. When I'm using this formula : (2*Pi*a*Sqrt(1-e2))/T(1±e) I get an answer in km/s which seams pretty good. (29,75 km/s) But...

I was wondering whether there is an actual scientific point of taking ground-based photographs of the Solar corona during total eclipses on Earth. It seems to attract a lot of attention from well equipped amateurs around the world and the pictures of the fine plasma structure surely look great...

According to the concept: when a planet revolves around a star, and when both the bodies move in circular orbits due to the interaction between each other, both the bodies can be replaced by a single body of mass ##\mu## revolving in a circular orbit of radius equal to the distance between both...

I'm quite aware of how to compute how FAR you are from the horizon, but my question is, how WIDE is the observable horizon at sea level (like, from left to right, how many kilometers is this): http://www.jeicentral.com/wp-content/uploads/2014/10/far_sunset_in_te_ocean_horizon-wide.jpg Thanks!

So I am working on making a simulation that shows the habitable zone of our solar system from now until our sun reaches the end of it's red giant phase. The sun will die when it is 10 billion years old and will reach the end of the red giant stage at 5 billion years. I know the habitable zone...

My question is, given that the Sun is composed almost entirely of just hydrogen and helium, why is the spectrum from it continuous and not an emission line spectrum? This applies to other stars as well. There are other elements of course present in the Sun, but they are present in very small...

Hello! These problems of mine are due in the morning. I'm not sure whether or not I will be able to figure them out in time, but I do need to understand the process in order to prepare for my finals. So any help would be much appreciated! Thank you. 1. Homework Statement A comet is in an...

Homework Statement The Earth's distance from the sun varies from 1.471 x 108 km to 1.521 x 108 km during the year. Determine the difference in (a) the potential energy, (b) the earth's kinetic energy, and (c) the total energy between these extreme points. Take the sun to be at rest. Homework...

I've recently been told by my mentor that the source for all energy is the Sun, which makes sense if were talking about chemical energy in photosynthesis, solar energy, etc. However, if we think about a meteorite which is due to hit the earth, surely we cannot say it got its energy from the Sun...

Hi! I have a question regarding the radiation coming from the sun. It might seem stupid to some people but I would really like to know how this works. When you see images of the sun's rays reaching the Earth for example on this image from wikipedia (see attached image). The rays are almost...

Homework Statement Comets travel around the sun in elliptical orbits with large eccentricities. If a comet has speed 1.5×104m/s when at a distance of 2.1×1011m from the center of the sun, what is its speed when at a distance of 5.1×1010 Homework Equations Conservation of energy The Attempt at...

Hi: I am a EE, but I have a question that I have searched for on the Internet and not found an answer. Contractors tell me that when it has been cold for several days and the sun comes out, that buried water lines that have not frozen all winter will suddenly freeze solid. It must be a real...

Hi All, http://arxiv.org/abs/1205.0205 Quite unbelievable! Anybody knows what is going on with the research of this, are the results confirmed, propositions of the cause?

Hi, I would like to understand the reason for the "Black sun" effect that occurs in CMOS cameras (very bright spots appear as dark). Thanks, ALex

Homework Statement 1)Find the gravitational force between then sun (2*10^30 kg) and the Earth (5.97*10^24 kg). Earths distance from the sun is 1.5 * 10^11m. 2) find the distance between a 5 kg object and a 10kg object if their gravitational force is 1*10^-4N. Homework Equations Fg=...

The sky is blue because blue light resonates with the air molecules and therefore has a higher scattering intensity (due to Raleigh scattering). Thus, we see blue light when we look at the sky (any light that we see, while not looking directly at the sun, must have been scattered). Is this...

1. (a) What is the distance modulus of the Sun? (b) What is the Sun’s absolute magnitude?2. I found the distance modulous using 5log(4.84E-6/10) to be -31.6. I feel like I need the apparent magnitude to get the absolute, my teacher is very vague about what we are given to use. Is there a way...

Homework Statement An astronaut went to sun from Earth by a rocket. According to the clock in the rocket, the traveling time was 5 minute. What was the velocity of the rocket? ( Earth is 8 light minute away from sun) Homework Equations t = \frac {t_0}{\sqrt {1 - \frac{v^2}{c^2}}}The Attempt at...