Sun Definition and 1000 Threads

Homework Statement How much charge would the Earth and Sun need to knock the Earth out of orbit. Then, assuming the distance from one proton to another and the length of one electron to another is 197 pm, find out how large of a block you would need of protium located on Earth and how large...

Please someone tell me why sun glasses have no power,though they are curved...

I am taking an astronomy class because I am interested in it and wanted to know more. I love all I am learning unfortunately my math skills are holding me back from getting all that I can out of this class. I realize this might not be the toughest math problem but can someone explain help me out...

The temperature of the sun is so high that the matter exists in plasma state.At such high temperatures electrons are not bound to the atoms.Does it mean that the sun is charged? If the sun is neutral, where do the electrons reside?

A comet near the sun whose orbit is________ would never be near the sun again is called what? My options are elliptical (I know its not this one), circular, hyperbolic, apogee, and following an inverse square law.

Hi all Currently, Voyager 1 is about 120 AU from the Sun. I wonder how big (or small) and bright would the Sun be seen from aboard this spacecraft . What approximate magnitude?. Thanks in advance.

In a assignment problem, I had to calculate the relative number of hydrogen atoms in the fundamental state, first, second and third excited states for a temperature of 5000 K. I used Maxwell-Boltzmann's statistics and I found out that (from memory) the most populated state was the fundamental...

Hi! I was just wondering if anyone knows where I can find a software/algorithm that can give me the postion of the sun and the moon in ECEF coordinates? If not, do you have any clues to how I might start building one? I am an engeneering student, so I don't have a lot of knowlegde about...

For a hypothetical system of a Sun and Earth (other planets absent), how can I compute analytically (or where can I find data on) the length of the year on Earth?

It is closer to Sun than the distance between Sirius A and B. Yes I know that the Sun wound't expand so much to touch Jupiter, however it would be anyway blowing its mass away. Would Jupiter have strong enough gravitation to absorb significant amount of mass?

So as I understand a perfect black body in physics would be one that would absorbs all the radiation wavelengts coming onto it ad let nothing out? If sun is a black body, we all know it emits both visible wavelenght, UV and other.The vast majority of the spectrum being in the visible light...

photos here: next time, 2117...YOU won't be here to see it then! http://www.dailymail.co.uk/sciencetech/article-2155140/Transit-Venus-2012-Spectacular-seen-time-2117.html

Homework Statement This is a conceptual question. Does the Earth orbit the sun or does the sun orbit the Earth? I know this is silly of me to ask. After all, everyone learns at a young age the the Earth -obviously- orbits the sun. We can represent the Earth orbiting the sun by defining the...

Thank you

Hello, I have been trying to compute the velocity of the star with respect to its local medium from the proper motion measurements. Sure, you can calculate the corresponding velocities by v = 4.74*(proper motion)*distance (in suitable units), but this resulting velocity is now with respect to...

Is it true that tint (say 5% or limo) will cause a sun roof on a car to shatter? If so, why? Common theories that people have said in car forums: 1) Light and energy during hot days gets trapped inside the sunroof glass, bounces back and forth, and eventually breaks the glass due to the...

Venus will cross the Sun on June 5-6 of this year. Historically, the transit of Venus holds a significant place in the history of astronomy. As most know, Kepler's third law stated the square of the period of a planet is proportional to the cube of it's mean distance. Newton's Laws of...

So I'm watching the sky at daytime, and i see the moon. The shadow on the surface of the moon goes in a straight line. I therefore conclude that the angle of MeMoonSun must be 90 degrees. But a peculiar thing shows; The shadow line on the moon is not perpendicular to the straight line between...

Okay i want to stir something up...do we Earth dwellers move around the sun in a roughly circular path (ellipse) OR are we moving in a straight line in a curved space? Dave

Hello, I've recently been trying to find out what colour the sun is, but I've had no luck. If you take a look at this picture: http://apollo.lsc.vsc.edu/classes/met130/notes/chapter2/plank_e_sun.html You can see that the maximum wavelength is in the green section. If so, shouldn't we see the...

Why Don't Planets "Fall" into the Sun? Ok, guys, I am new to physics (just studying it on my own before taking it next year in school) and watched a bunch of videos online about general relativity and gravity. I'm sort of stuck, though, with why if general relativity explains gravity as...

Now I am wondering what would happen to the sun if it was hit by the nearest gamma ray burst (I believe the nearest one is 6.7 Light years away). Now I understand that a gamma ray burst is going to be more radiation than what the sun produces in its lifetime. I also know that the sun is just one...

Hi, I'm just after a definitive answer on how Hydrogen fuses into Helium in the Sun? Some places say the Sun is so hot that they overcome their same charge repulsivness and fuse together while other places say that our sun is not hot enough for that to happen and that they just get close...

I recently came across an interesting video. What do you think it might be? http://www.youtube.com/watch?v=Ypqfq0SYrAQ&feature=player_embedded

Homework Statement Given the distance from the sun to Earth xE, the distance from the sun to venus xV and the mass of the sun m calculate the time delay due to gravity in receiving a radio signal sent from Earth to venus (and reflected back). Ignore the gravity fields of venus and earth. Venus...

Is the sun a passive or active blackbody? Thanks

What is the minimum angular distance from the Sun for Venus to be visible TO THE NAKED EYE?

I am currently doing a bit of research into the history of our understanding of the solar magnetic field. It is quite interesting. As I understand it, sunspots, which were observed at least as early as the time of Aristotle, were the first solar magnetic phenomenon to be observed. Can...

Hi, I'm a student doing a project that involves building a model house with passive solar heating system. I'm curious if there is a way to approximate the amount of heat I will absorb through a south facing window on a sunny day, in early April. I realize this depends on many variables, but...

Homework Statement An observer 5pc away observes the sun in the plane of Jupiter orbit. He cannot resolve either object but he notices a slight dimming of the star when Jupiter passes across the sun in his vision. Find the magnitude of the sun with and without Jupiter in front of it...

Hi, Due to Earth's axial tilt, the Sun's annual motion is along the ecliptic that is tilted to Earth's celestial equator. When the Sun crosses the equator at both equinoxes or solstices, the Sun's daily shift is at an angle to the equator, so we have to do the projection of this shift onto...

Hello, we try to design and build a sun tracker carrying a plate photvoltaîque, piloted by GPS, GPS must locate the position of the sun and gives an order to move towards this position throughout the day, but we really do not know where to start all your suggestions and ideas will be...

Hi, We are using a radio interferometer to measure the angular diameter of the Sun. An in depth description of how this is done is not relevant to solve the immediate problem I have. But briefly, we rotate the interferometer in azimuth so that the direction it's looking at traverses across...

I'm a huge noob and I don't know much about physics and space and stuff, but I was thinking about this in the shower today.. Anyone care to comment? Or correct me on anything? Ok, so I was talking about to Daniel about Gravity, the Sun, and Black Holes.. (Yes we are ghetto nerdy xD) And i...

I'm just doing some reading on stars and I've hit a problem which I can't solve. According to a book I'm using it claims the amount of hydrogen converted in the Sun over it's lifetime so far is 5.4x10^55. I roughly agree with this figure using the method this author calculates the number. He...

I am trying to figure out what size eaves we need for our house extension. I've tried a few calculations and now I'm posting here in the hope that a logical thinker will be able to tell me what I'm doing wrong. We live in Adelaide, Australia, and we want to put in glass double-doors on a...

First of all, I apologize if this is not the right place - it's my first post (although I've lurked for a while), so... er. Doomsday question. I'd like to know how big the sun will get - visually (but please without °, I am not educated enough to understand those) - at the end of its life...

Homework Statement in part 1 i used the Saha equation to calculate that the hydrogen in the center of the sun was fully ionized (given temperature and central electron density). part 2 says: Re-examine the result by computing the average separation of atoms at the center of the sun knowing...

Homework Statement The question is what is gravitational force between the Earth and the Sun. We are given the formula F = Gm1m2/d2. I found the mass of the sun and the Earth the gravitational constant and the distance. my issue is the G of the equation. G=6.674 x 10^-11 m^3 / kg s^2 my issue...

When we say that expansion of universe is like that of balloon, are galaxies and other objects are papers pasted on balloon (only balloon expands, paper does not) or are they like printings on balloon(printings too expand). if it be second case, do we automatically mean that galaxies...

Homework Statement You and a friend decide to determine the radius of the Earth. You synchronize watches; then your friend drives 50km due west, at latitude 40°. Each of you determines the time when the Sun lies due south -- on the meridian Your friend observes the Sun to be on her meridian...

Hi, ive been studying formation of solar system and couldn't find an explanation for why the sun didn't absorb heavy elements from early solar system? why they remained around the sun and formed planets and not get absorbed to the centre? thanks in advance

Why does the Earth orbit the Sun, but the Moon pull on Earth's tides? Earth orbits the sun, proving that the Sun has a greater gravitational pull on the Earth than the Moon. However, the Moon control's Earth's tides (unlike the Sun), which proves the opposite-the Moon has a greater...

Is Quantum Tunneling necessary to explain why The Sun keeps shining , due to it not being hot enough to provide the necessary energy for protons to collide?

Homework Statement Suppose you seen the Sun rise on the day of the summer solstice from latitude 43.5. What is its azimuth at the moment when it rises? (Note that to specify an azimuth, you can describe it as being so many degrees in a particular direction starting from a reference point...

Homework Statement A comet is approaching the Sun from a vast distance with velocity V. If the Sun exerted no force on the comet it would continue with uniform velocity V and its distance of closest approach to the Sun would be p. Find the path of the comet and the angle through which it is...

Hey all, I wake up with morning to find an email from spaceweather which says: EARTH-DIRECTED FLARE: Active sunspot 1401 erupted today, Jan. 19th, for more than an hour around 16:00 UT. The long-duration blast produced an M3-class solar flare and a CME that appears to be heading toward...

In our Solar System, what is the best example of a planetary moon having its own satellite? What general properties do such satellites share?

okay so I don't want this to be an argument on whether dumping nuclear waste into the sun is feasible or practical or not, as I'm pretty sure it's not rather I'd like to ask a question that my mom asked me once when I was trying to argue the idea to her. She asked me: "well if you dumped so...