Sun Definition and 1000 Threads

  1. N

    Earth Flying Away from Sun: What Does the Math Say?

    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...
  2. michael879

    Sun Bending Light: Gravity Warps Space-Time?

    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...
  3. wolram

    Earth-Sun Relationship & Global Warming Effects

    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...
  4. turbo

    Paper - Sun not powered by H fusion

    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
  5. A

    How long would daylight last on Earth if the sun disappeared?

    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...
  6. A

    How Do Nuclear Power Plants and the Sun Generate Energy?

    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...
  7. Andre

    Is the Sun Responsible for Global Warming?

    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...
  8. L

    Sun Interference astronomy question

    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...
  9. S

    Is the Sun Actually Orbiting the Earth?

    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?
  10. O

    How does the distance of a planet from the sun affect the temperature?

    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.
  11. A

    Why does the sun generate white light?

    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?
  12. M

    Is the LuniSolar theory a legitimate scientific theory?

    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...
  13. T

    The size of the sun using pinhole imagery

    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...
  14. M

    Dark Sun: Has Anyone Read It? Share Your Thoughts

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

    Building Sun Resistance for a Bald Head

    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
  16. G

    New Planet Bigger than Pluto Found Orbiting Sun

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

    Total Eclipse of the Sun: 40s Before Alignment

    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:
  18. M

    A solid surface model of the sun.

    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...
  19. M

    Is the Sun's Surface Actually Solid and Electrically Conductive?

    I believe that I have compiled compelling evidence from the TRACE, SOHO and YOHKOH satellite programs to suggest that the sun has a solid, electrically conductive surface that lies underneath the photosphere. You can find my website with lots of video and photographic evidence to support this...
  20. N

    Is the sun moving simple harmonically up and down also?

    is the sun moving simple harmonically up and down also?
  21. G

    Sun Rise Laser Cannon Aiming - Unraveling the Mystery

    ok... So, we see the sun everyday, right? So let's say you are standing on one point of the Earth looking at the sun rise... At where must you point a laser cannon in order to hit the sun dead centre? and why? :confused:
  22. P

    Name two things that signifify a trip around the sun

    My Professor posed a riddle in class today. He said "Question: Name two things that signify a trip around the sun". I not very good at riddles, but I know that Earth travels around the sun once a year. Thus the changing of seasons could be argued as signifiers (earth rotates on it's axis as...
  23. R

    Newtonian Gravity- Body 'falling' into the sun integration problems

    The problem is this: Given sun of mass M and a body of mass m (M>>m) a distance r from the sun, find the time for the body to 'fall' into the sun (initially ignoring the radius of the sun). Our first equation is therefore \ddot{r} = \frac {GM}{r^2} . I am able to integrate this...
  24. A

    Calculating the Net Force on a Spherical Shell Around the Sun

    I am beyond lost with the question, so any help would be greatly appreciated. Consider a solid, rigid spherical shell with a thickness of 100 m and a density of 3900 kg/m^3. The sphere is centered around the sun so that its inner surface is at a distance of 1.5×1011 m from the center of the...
  25. G

    For those of you that have criticized Sun

    It appears that Linus Torvalds has joined the OpenSolaris Community Advisory Board (CAB). http://richteer.blogspot.com/2005/04/opensolaris-community-advisory-board.html In the meanwhile, rumors are circulating the CAB that Linus will be announcing a fork of the Linux kernel to Sun's CDDL...
  26. P

    How does light interact with objects?

    Orbits What does our galaxy orbit? more questions will follow once previous ones are answered
  27. P

    What do we see first?What Do We See First: The Sun or the Light?

    I have a question for you all. I asked my Physics teacher this in school not so long ago. I made an animation of it on a little art thing (which rocks btw, I suggest you all use it for your examples or theoreys) http://artpad.art.com/gallery/?idilmbnxbps In a nut shell: You're on a...
  28. A

    What Happens When Water is Launched Into the Sun?

    i have a feeling this was answered a while ago. however, my problem is, a shere of water (as it is in space) is launched into the sun from here, assuming it hits no graviational fields and continues on it's path into the sun, the following will happen: 1. the water, frozen from its trip...
  29. U

    Calculating Speed of Comet at Greatest Distance from Sun

    A comet moves in an elliptical orbit around the sun. It's closest approach to the sun is 0.59 AU and its greatest distance form the sun is 35AU. If the comet's speed at its closest approach is 54 km/s what is the speed when it is farthest away? Angular momentum is conserved and the gravitational...
  30. E

    Is Teegarden's star really that close?

    Could it be that all the stars we see in the sky no longer exist?
  31. E

    Ahad radius - where the Sun loses its supremacy

    This is relevant to solar astronomy, defining the edge of Sol's supremacy as the overwhelming provider of all light and heat to our Solar System - On any interstellar journey going outward from Earth, one eventually reaches a point where the total amount of light received from our Sun is...
  32. B

    How do we know what the sun is made of?

    We all know that stars, for example the sun, are made up of particles such as hydrogen, but a friend challenged me recenlty asking HOW we know this, and I was forced to admit that I didn't know the answer... so how do we know? probably a simple question, but my so-called "expertise" is more...
  33. A

    Finding Solar Path Data - Resources for Sun Position in Sky

    Hello, does anyone know of any good resources for solar path data? Like what angle in the sky the sun is at for different parts of the year. Thanks, AL
  34. S

    Trajectory of earth if sun reduced and earth velocity increased

    I need Help! I've got this question which I can't Answer : If the mass of the Sun is reduced by 1% and the Earth's velocity is also reduced by 1%, what will be the trajectory of the Earth?
  35. B

    Calculate Sun Angle: Length of Object by Shadow

    Can somebody explain how to calculate the sun's angle in the sky at a certain time of day? It is wanted to calculate the length of an object by it's shadow.
  36. B

    Was the sun ever a blue star in the early stages of its life?

    Was the sun ever a blue star in the early stages of its life? does this mean for a proportion of the time of the 5 initial billion years of the suns lifetime, the planets were cooking because of the suns initial powerful (blue) heat?
  37. E

    The Sun revolves around the Earth?

    Hi everyone, I am fairly new to PF. So I start off with a rather strange idea, derived from SR. According to the first postulate of Special Relativity, it would be more accurate to say that the sun revolves around the earth, because we are stationary relevant to the earth, right? Correct...
  38. Andrew Mason

    Sun tides and tidal torque on the earth

    It is said that the moon's tidal forces on the Earth create differential torque which causes a slowing of the Earth rotation. It is said that this causes the moon to increase its radius of orbit. The remarkable result is that rotational energy of the Earth is transferred to the moon to increase...
  39. O

    Why is the Sun Expanding Beyond Earth in Seconds?

    Alright. Now, I understand that the Sun is 1/2 way through its complete H-He fusion cycle, and I realize that after this fusion cycle, it will pass through all the elements until Fe, (i don't know whether it passes through each element in 7 seconds, or it takes 7 seconds for each element). My...
  40. D

    Solving Escape Velocity of the Sun: Troubleshooting an Error

    I can't seem to obtain the right answer using the escape velocity formula. I think my problem is with the gravitational constant. I would like to find the escape velocity of the sun. v_e=\sqrt{\frac{2GM}{r}} or v_e=\sqrt{\frac{2\mu}{r}} v_e_\odot=617.54(km/s)...
  41. H

    N-body simulation test with sun, earth and moon

    Hi ! first, excuse my english, I'm just a poor french student... and we are so bad in languages here... anyway.. I'm trying to make a little program which could calculate the motion (and some other little things) of n bodies linked with gravitationnal interaction. (my final aim will be to...
  42. B

    Rotating Coordinate Systems: Are Geocentric and Heliocentric Views Equivalent?

    Hi, I have a question that and I am unable to come up with a consistent and simple answer to. If we consider a coordinate system centered at the earth, then all planets, the sun and indeed the rest of the universe is rotating around the Earth in a very complicated way (as measured in this...
  43. P

    Centripetal acceleration of Earth around Sun?

    New question: centripetal force? I can't seem to get the right answer... R = 1.50 x 10^11 and I figure that 1 day/rev = 86400 sec/rev So: \frac {2 \pi 1.50 * 10^{11}}{86400} is the velocity, and then plug that into \frac {v^2}{r} but I keep on getting 700 something..what am I doing...
  44. R

    Investigating the Effect of the Sun on Tides

    Why isn't there a more pronounced effect from the Sun on tides? The distance from the Earth to the Sun seems negligible considering the mass of the Sun. While typing this out and thinking about it, the most reasonable explanation I can come up with is that the Sun has so much mass that the...
  45. D

    Why does a bight object like the sun have negative magnitude?

    Why does a bight object like the sun have negative magnitude? TY
  46. 0TheSwerve0

    What's Your Sun Sign? Share Your Zodiac Placement!

    I was going to make a poll including each sign, but there are only 10 options. Just post your sign (and Moon's sign or Ascendant if you know it). The only thing I'd anticipate is an absence of Taurus and Capricorn. Unsure, born on the cusp? Be sure Sagittarius (Aquarius Moon)
  47. S

    If Sun = 98% H & He, why continuous spectrum?

    If the Sun is 98.4 % Hydrogen and Helium by mass, and 99.8% by number of atoms, why does it radiate a continuous spectrum of light? Why doesn't it radiate a bright emission line spectrum only at the Hydrogen alpha, beta, gamma, etc. lines plus the Helium lines, and little or no lines at...
  48. W

    Estimate Sun's Rotation Period as a Neutron Star

    Could someone help me start this problem. My mind it in the angular momentum mode and I am having trouble seeing where to start on this one. :confused: The sun's radius is 6.96E8m and it rotates with a period of 25.3d. Estimate the new period of rotation of the sun if it collapses with no...
  49. D

    Earth's Orbital Speed Around the Sun

    The Earth has an orbit of radius 148 million km around the sun. What is the speed of the Earth on this orbit? dont know how to do it i have used a couple of different formulas and haven't gotten it right can anyone help?
  50. S

    What Is the Correct Calculation for the Mass of the Sun?

    hey there, i am having trouble with what should be a really easy question! ********* calculate the mass of the sun assuming that the Earth's orbit is circular and with a radius of 1.5 * 10^8 km i got the period of the Earth's orbit around the sun in seconds: 60*60*24*365.25 then used...
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