Sun Definition and 1000 Threads

I've been hearing these talks that the sun will run out of hydrogen in 4.5 to 5 billion years from now. My question is, how did we arrive at this estimate. Is it based on the mass or something? It would be good if you can show me the mathematical calculations. --thanks.

Ok so if the center sun of our gallaxy is in sagattarius then what degree is it in sagattarius. If the Earth and the sun and the center sun were in aline once a year then would I have to see the oppisite consalation of sagattarius at the oppisite degree of the center sun in the center of the...

Last night I watched a program on TV that made the statement that in the interior of our sun the gravity is so intense that a photon of light can travel only several thousandths of an inch per minute. It takes hundreds of thousands of years for a photon of light to travel from the interior of...

The Earth is subject not only to the gravitational force of the moon but also to the gravitational pull of the sun. However, the earth is much farther away from the sun than it is from the moon. In fact, the center of the Earth is at an average distance of 1.5 x 10^11 m from the center of the...

a)calculate the mass of the sun from the radiuos of the Earth's orbit (1.5 x 10^11m), the Earth's period in its orbit, and the gravitational constant of G. Sohere we are given the speedof light, 3x10^8, and G as 6.673x10^-11 so i get that v=2pi x r / T and that r= ct how do i continue...

Whenever something interesting happens on the side of the sun that faces earth, is there any orbiting satellite that can simultaneously view the opposite side?

Astronomy Help Please! :) I am having a problem figuring out this question. On all my other work the questions have been different. Could anyone help me with this Astronomy problem and show me how to work it out? Thank you! Anything would be greatly appreciated. What is the absolute...

How far from Earth must a space probe be along a line toward the Sun so that the Sun's gravitational pull on the probe balances the Earth's pull? I'm actually just confused as to how to set this up. I know that I need to consider d being the distance from the Earth to the sun and r being the...

The sun exerts a force of 4.0 X 10^28 N on the earth, and the Earth travels 9.4 X 10^11 m in its annual orbit around the sun. How much work is done by the sun on the Earth in the course of a year? Explain.

The Sun subtends an angle of about 0.5 degrees to us on the Earth, 150 million km away. What is the radius of the Sun? theta=l/R (2pi rad/360 degrees)0.5 degrees=2pi(150,000,000 km) This should be simple, but the answer I get seems to not sound right at all Have i set this up correctly?

Can anyone kindly describe to me in simple words what is sun’ conveyor belt all about and how it is link to solar storm? Thanks

Don't know how long they keep these linked, but it's a great shot! http://news.yahoo.com/photos/ss/photos_highlight_fp;_ylt=Atn756jNDFDUJDaq4wjpvw.s0NUE;_ylu=X3oDMTA2Y3J1dWFkBHNlYwNwaA--

Why? It's a optic effect? It's taken with digital camera. http://img166.imageshack.us/img166/15/solplayahm9.jpg http://img83.imageshack.us/img83/7657/phot0047zc4.jpg :bugeye:

The picture was taken last Holy Week: April 13, 2006 while in a ferry ride from Samal to Davao (both in Philippines). I took the photo and noticed a black spot in both pictures. Can anyone explain the spot. Anyway, it was took about 4:50PM, the last ferry going to Davao.

The picture was taken last Holy Week: April 13, 2006 while in a ferry ride from Samal to Davao (both in Philippines). I took the photo and noticed a black spot in both pictures. Can anyone explain the spot. Anyway, it was took about 4:50PM, the last ferry going to Davao.

I was wondering if anyone knew if you look at the Earth and see a sunset from space would you see the orange clouds from space? I think it would be cool to get a picture of the orange clouds from space... or something to that affect. I don't even know why I just thought of that lol. I am...

We know, that photon change direction for 1.75'', when it flies close to the sun. This angle is proportional to radius of the sun. If we calculate clasically the angle is 0.82'' (arc second). Which is momentum, which is given to sun (or black hole) by the photon change of direction. Is the...

Does anyone else find this scary yet cool at the same time?:rolleyes:

Ok, I got this problem and I don't know where to start... "The average distance from the Earth to the sun is 9.30 x 10^7 miles. Light travels at a speed of 3.00 x 10^8 meters per second. If the sun were to be suddenly extinguished, how many minutes would it take for the effect to be visible...

How deeply into the Sun can we see? What are we actually seeing? Is wavelength related to how much we can see into the sun?

The Solar System is traveling around 155 miles a Second around the Milky way Galaxy. There are 31,556,926 seconds in a year. We will round off the Age of our sun from 4.76 Billion to 5 Billion Years for easier figuring. If we Multiply 31,556,926 seconds by 5 Billion Years we get...

Question says: Approximately how much energy would be required to ionize all the hydrogen in the Sun? How does this ionization energy compare with the thermal energy of the Sun? (Assume the uniform density approximation. The ionization energy of a single hydrogen atom is 2.18e−18 J.) Am...

http://www.acme.com/jef/singing_science/sun_shine-32.mp3

In about 5 billion years the sun will become a red giant. Would it be possible to stop with furtristic (super extrme) technology. Like by putting more hydorgen in the sun or somthing. It might be possible assuming that if were still alive that we could have the technology to that five...

good day to everyone, i wish to ask what chemical in our environment asorb some energy from sun? and what it has to do with high C02 level in the atmosphere? thanks in advance

I would like to calculate with high-accuracy the apparent geocentric positions of this three: Spica, the sun and moon. I will apply the following corrections for Spica: 1. proper motion 2. precession 3. rotation of ecliptic 4. stellar aberration 5. annual parallax 6. gravitational...

Hi, if someone could help me figure this out I'd really appreciate it. Estimate the average power output of the Sun, given that about 1350 W/m^2 reaches the upper atmosphere of the Earth. I know the answer is 3.8 X 10^26 W but I don't know how to get there. I've tried different equations...

Cornell's award-winning solar house to be auctioned April 7 By Susan S. Lang http://www.news.cornell.edu/stories/March06/solar.house.auction.ssl.html

Hi, I'm a middle school student who enjoys astronomy and I volunteer at a local science center. At that science center I have no trouble answering questions about the visual aspect of astronomy, but I do run into some trouble when I am asked about the "techy" or mathmatical side of the science...

why sun looks bigger in the evening? although it's closer to the Earth during noon?

If I am to understand correctly, light speed is the speed at which light travels through space. As I also am led to believe, our sun is some four lightyears away. I recall hearing that since it takes roughly four years for light to travel from the sun to us, the light we see during the day...

In the future when the sun ejects its outer layers as it becomes a white dwarf would there be enough ejected matter flying around the solar system to allow Jupiter to gain the required mass to become a star.

I have seen an article about the Earth flying away from the sun due to the use of nuclear energy: the Earth becomes lighter as we convert mass into energy, therefore the sun pulls less on the earth, causing the Earth to fly away from the sun. See...

wasnt the fact that the sun bends light coming from distant stars proof that gravity warps space-time? I am sure I am wrong but can someone explain to me how they know it wasnt just refraction of the light as it passed the sun's "atmosphere"? Light bends around Earth due to our atmosphere and...

http://www.wxresearch.org/papers/orbit2004.htm This orbital motion of the Sun has an effect on the Sun. Keep in mind that the Sun is merely a ball of gas. If this orbital motion has effects on this ball of gas we call the Sun, then one could expect it to have similar effects on spherical...

This is a pretty interesting theory on the evolution of stars and planetary systems. If you have the bandwidth, watch the movie linked in the paper. Has anybody seen this movie before, and are there alternate interpretations? http://xxx.lanl.gov/ftp/astro-ph/papers/0511/0511379.pdf

what are the consequences of Earth if our sun had somehow disappeared? can someone prove how long daylight on Earth would evaporate if the sun disappeared? I think it'd be equivalent to the speed of light, which is 8.3 minutes because that is how fast light travels from the sun to the Earth...

Nuclear Power Plants and the Sun I need some help again...:frown: 1. What are the fuel sources? 2. How is the fuel used to produce/release energy? 3. What are the similarities in the way they produce energy? 4. Are there any health hazards associated with the way they produce...

This paper has been stalled for almost a year and concequentely misses the latest climate reconstructions (Moberg etc) but finally somebody got the most brilliant and original idea:rolleyes: that the heating source itself may perhaps not be ruled out completely as a factor determining...

A radio wave undergoes a phase shift of 180 degrees when it reflects from the calm surface of the ocean. In early days of radioastronomy, Australian Astronomers observed the interference between a radio wave arriving at the their antena on a direct path from the sun and on a path involving one...

Now, the conventional way of viewing the solar system is that all the planets orbit the sun, but since you can declare anything at rest in space, can't you just as easily say that the sun is orbiting the earth, since it will appear that way if you hold the Earth at rest?

my evil teacher is making me and my friend to do a 12 page report. and the question is "how does the distance of a planet from the sun affect the temperature?" i would really apperciate it. thanks.

and does the sun also genrate the full EM spectrum? why does it do that and not a certain wavelength, is it possible to have certain ones, is that what dead stars do, like pulsars only emit radiowaves?

Any thoughts on this, fellas? I have not read the book nor viewed the documentary (narrated by James Earl Jones) but I have read a few articles, and, well, precision is a complex sport, so I am intrigued with the notion...I am no astronomer though, only have a layman's fascination...

Does intensity of the sun affect this? I keep trying to do it, and when you have a square shape you should still see an image of the sun.. right? Well it is not working! I live in a place with VERY intense sun and no clouds... could this be the problem? Any help!? Thanks so much...

Has anyone read Dark Sun by Richard Rhodes? If so what did you think of it? ~Kitty

okay I know my the top of my head hasnt been exposed to much sun so it will burn easily since I shaved it BUT isn't it good that it gets SOME exposure to sun so that it will build resistance to it? Thanks

Interesting article; makes you wonder what we would really define as a "planet." http://news.scotsman.com/international.cfm?id=1707552005

Why do total eclipses of the Sun by the Moon reach maximum eclipse about 40 seconds before the Sun and Moon's gravitational forces align? :bugeye:

I believe I have put together a pretty compelling case to demonstrate that the sun has a solid surface made of calcium ferrites that form structures and emit electrical arcs. This model is based on observations from the Sert program and SOHO, TRACE and YOHKOH satellite data. You can get the...