Sun Definition and 1000 Threads

I wonder if the whirlpool that was recently discovered on the sun effects our weather on earth. http://space.newscientist.com/article/dn14878-hurricanesized-whirlpools-spotted-on-the-sun.html

Is the sun actually dying because I have heard a lot of good scientists near where I live say that it is and is not, and, of course, argue. I'm really wondering will t happen, I know if it does it'll be in like 4.4 Billion years but I want to know is IF it will happen.

Homework Statement (a) Compute the specific energy generation rate of the Sun as a whole. (b) Assume a human of weight 100 kg has a “luminosity” of 100 W. Compute the specific energy generation rate of a this human. Homework Equations Need help with the equations part. The...

HELP! (again) Homework Statement The sun sets, fully disappearing over the horizon as you lie on the beach, your eyes 20cm above the sand. you immediately jump up, your eyes now 150cm above the sand, and you can again see the top of the sun. if you count the number of seconds until the sun...

Homework Statement If the Earth were suddenly stopped in its orbit, how long would it take for it to collide with the sun?(Regard the sun as a fixed point mass. You may make use of the formula for the period of the Earth's orbit. Homework Equations tau=(4*pi^2*R^3/M*G)^.5 The...

Homework Statement Find some combination of G, the speed of light c, and some arbitrary mass M, that has units of length. Then evaluate your expression for the mass of the Sun (that is, find the characteristic length associated with that mass). Give your answer in units of km. The...

Homework Statement I'm carrying out a lab to investigate the power of the sun. I'm supposed to compare the light intensity of a 100W light bulb with the light intensity from the sun, by comparing the radiating heat on my cheeks (one cheek pointing to the sun, the other to the bulb). I found...

Is the Pioneer Anomaly really directed towards the Sun ? How sure are we ? Why not directed around the Sun ?

http://arxiv.org/abs/0808.3283 This is weird as hell. As far as I knew, nuclear decay rates were not affected by anything, except beta decay under electromagnetic fields. This could possibly have huge consequences in other sciences. Personally, I immediately went to post this in Earth...

If the Earth's period is 365.25 days and its distance to the (center of the) Sun is one astronomical unit (AU), what is the period, to the nearest day, of an asteroid in a circular orbit about the Sun with a radius of 3.04 AU? please show steps so that I can learn. thanks a lot.

Can someone tell me at what mileage point a rocket launched from Earth toward the sun would have its primary gravitational draw shift from the Earth to the sun?

There's coming sun eclipse on Aug 1. I know that looking directly at the sun even though it is mostly obscured is unsafe to the eyes. But is it safe if I look at the sun eclipse when it is about to set?

How is the sun Earth distance currently determined? I read about a method where the distance between the Earth and Mars is determined when they are in opposition using parallax. Knowing the orbit period of both Mars and the earth, Kepler’s third law is then used to determine the Earth sun...

Someone I know recently stated according to General Relativity, the following statements are both correct: 1. The Sun rotates around the Earth. 2. The Earth rotates around the Sun. Is this true?

Homework Statement Mars's orbit has a diameter 1.52 times that of Earth's orbit. How long does it take Mars to orbit the Sun? in years. Homework Equations I tried using T^2=4(pi)^2r^3/GM I got 1.88years...but its wrong... The Attempt at a Solution

A surprisingly small number of photos submitted for a theme that is right smack in the middle of the summer months here in the northern hemisphere. Still, we have a good group of photos. Please choose a photo that best depicts the spirit of having fun in the sun. 1. matthyaouw 2...

Fun in the Sun This week's theme involves all the fun activities we do during the warm days of summer. Zz. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure...

The Sun and Moon appear larger while near the horizon. The explanation I heard for this optical illusion is that when the Sun and Moon are near the horizon our brain(eyes) have something to reference their size to therefor making them appear larger. But which is their actual size? Is the size...

Homework Statement Which of the following is a true statement concerning a comet passing near the sun? (Mass of comet and mass loss are negligible) 1. The momentum of the comet is nearly conserved because the interaction with the sun is similar to an elastic collision. 2. The momentum of...

I need to check a calculation for reasonableness. When I plug in the values for Earth and the Sun, I get a rough approximation of tidelock about 5.5 Gy after formation of the solar system. Is that anywhere close to the right answer?

Why is it said that light takes 8 minutes to reach Earth when light from sun is already present in the solar system , what is meant exactly by the statement ?

Homework Statement "Calculate the gravitational force between: A) The sun and the earth B)The moon and the earth" Homework Equations F= M/r2 The Attempt at a Solution A)The sun and the earth Earth: mass 5.97*10^24 kg Radius 6,380,000 meters Sun: mass 1.99*10^30 Radius...

If the sun is converting matter to energy it must be losing mass at roughly one Earth mass per 43 million years (calculated from the solar constant). How would the loss of solar mass affect the Earth's orbit?

How do scientists know that the Sun orbits the Milky Way? Is this something more ancient scientists knew or could have known hundreds of years ago?

Homework Statement a planet is 2.00 a.u. when it is closest to the sun. its eccentricity is .5000. Find its period in years. Homework Equations The Attempt at a Solution i got this so far... don't know if it is right PD + AD = A -AD - PD = F <SUBTRACTING THESE TWO>...

[SOLVED] gravity fun Homework Statement 1. Calculate the speed of objects on the Earth's surface caused by the Earth's own rotation around its own axis. 2. Find the mass of the Earth using its time period of revolution of the moon around the earth. 3. Find the mass of the sun using the...

Just sitting around BS'ing with a couple of friends this morning about the solar system and gravitational balance- and I began to wonder how long the Earth and its inhabitants would last if the sun suddenly quit emitting energy. How long would our atmosphere retain enough heat to keep us from...

that it would burn everying in a 90 mile radius, or something like that, is this correct? Would this be the same as if the equivelant amount of hydrogen atoms fused all at once together?

If the Earth orbits the sun how can astronauts fell no attraction to the sun in space. Even pluto which is 4500 million years away, still orbits the sun.

I ran across some article that pointed to this research: http://www.omatumr.com/picpages/snexplo.html The theory states that Sun formed from accretion of supernova remnants back into/onto its core. Now, my scientific background is quite limited but this theory seems to me more realistic...

Obviously life on Earth must get energy from the Sun. But MOST of the Suns energy must be radiating out into space, pretty much "wasted" from our perspective. So, my question is, about how much energy do you figure the sun produces per second? What sort of things on Earth could be powered...

What time of the year is the Earth closest to the sun? Does this time vary?

Hello All, Please excuse my ignorance. I have a number of questions about the sun. Space is cold, yes, very very cold, close to absolute Zero. I have heard the argument that it is solar radiation or through convection that the heat from the sun reaches us. However I still can't get my head...

I saw in a website that Einstein found the deflection angle of a ray grazing the sun through this relation alpha=4GM/c2r=1.74 arc sec but when i used this relation by giving values i didnt get this value 1.74...wats wrong..can anyone solve this ...

[SOLVED]Forces: acceleration with a sun yacht Homework Statement Sunjamming. A “sun yacht” is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny in everyday circumstances, it can be large enough to send the spacecraft outward from the Sun on a...

[SOLVED] luminosity of the sun What equation do you use to figure out the luminosity of the Sun if you are given the amount of energy the Earth receives from it?

What is the angular velocity of the sun? thanks

Hey, Does anyone know where to find a value for the radial velocity of the Sun wrt the Earth? I've tried googling, but it always gives the radial velocity wrt the LSR. Thanks muchly!

I just learned the sun has an equatorial rotation rate of approximately 25 Earth days, and a polar rotation of approximately 31 days. Intuitively, by the laws of physics, it should be the other way around: longer at the equator and shorter at the poles? Also, if our solar system is within...

I have a question that I can't figure out. In the Sun, it takes several hundred thousand years for a photon released in the core to reach the surface. Use the speed of light and the radius of the sun to estimate the escape time for a photon from the center of the sun if there were no...

Hi, Is it posible for us to determine the velocity of our sun? The Hubble constant gives a referent for the exspansion of the universe but do we have any way of knowing if the point at the centre of the big bang was, (or is), stationary? Do we know in which direction the centre of our...

[SOLVED] Amount of Energy emitted from the sun to the earth Homework Statement The Sun's surface temperature is 6000 K. Assume that the radiation emitted from the Sun moves radially outward from the Sun and that no radiation is absorbed between the Sun and Earth. How much energy in the form...

Problem: The Earth's orbit (assumed circular) around the sun is 1.5e11 m in radius, and it makes this orbit once a year. What is the centripetal acceleration of the earth? Equations: a = (v^2) / r T = (2*pi*r) / v My work: T = (2*pi*r) / v; 1 year = (365 days / 1 year)*(24 hours /...

Homework Statement How many Earth's would fit inside the sun? Homework Equations The Attempt at a Solution I found the volume of the sun and the Earth (Using the sphere volume formula) and devided the sun's volume by the Earth and got 10^6...I was wondering whether this is the...

I'm having trouble getting the answer to this homework question: How many Earths would fit into the Sun? can you guys help me in solving it, please? Thnak you

Homework Statement To better comprehend the gravitational force between the Earth and the Sun, pretend gravity is turned off and the pull replaced by the tension in a steel cable joining them. How thick would such a cable need to be? You can estimate the diameter by knowing the tensile...

A long while ago I had this idea for a plot of a story. Now I'm not so sure my logic is right. If I were to place a (perfectly) mirrored parabolic dish out near Pluto, point it at the sun and put my (tiny point-like) spaceship at the focus, how big would the parabolic dish have to be to give...

Some of my friends are arguing how gas giants were created far from the Sun, while the rocky planets were in the inner orbits. One of the ideas is at first they were all the same: gas giants, then the solar wind blew the outer layers of the inners and they became rocky. How do you think of this?

I am doing some research for a graphic novel I am building with a group that will take place on Gliese 581c/Gliese 581d and am trying to get as accurate information as possible about what the sky, light and plant life would look like in either of these environments. Could this be an accurate...

Why I can burn a paper with magnifying glass and sun? Isn't it something to do with the electromagnetic field (because light is itself electromagnetic field)?