What is The sun: Definition and 634 Discussions

The Sun is a British tabloid newspaper. As a broadsheet, it was founded in 1964 as a successor to the Daily Herald, and became a tabloid in 1969 after it was purchased by its current owner. It is published by the News Group Newspapers division of News UK, itself a wholly owned subsidiary of Rupert Murdoch's News Corp. Since The Sun on Sunday was launched in February 2012, the paper has been a seven-day operation. The Sun previously had the largest circulation of any daily newspaper in the United Kingdom but it was overtaken by rival Metro in March 2018.In 2012, The Sun on Sunday was launched to replace the closed News of the World, employing some of its former journalists. The average circulation for The Sun on Sunday in September 2019 was 1,052,465.In February 2020, it had an average daily circulation of 1.2 million. The Sun has been involved in many controversies in its history, including its coverage of the 1989 Hillsborough football stadium disaster. Regional editions of the newspaper for Scotland (The Scottish Sun), Northern Ireland (The Sun), and the Republic of Ireland (The Irish Sun) are published in Glasgow, Belfast, and Dublin, respectively. There is currently no separate Welsh edition of The Sun; readers in Wales receive the same edition as the readers in England.

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  1. N

    Chemical composition of the sun

    This website gives a break down of the ten most abundant elements from spectrum analysis of the sun http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/961112a.html" Presumably this result is only valid for the surface/near surface of the sun. If there were any heavier elements present...
  2. Philosophaie

    Magnetic Field of the Sun will Flip

    Magnetic Field of the Sun will Flip I believe some time in November if I am not mistaken. It happens about once every 11 years. I am currently monitoring sites like: http://www.swpc.noaa.gov/SWN/sw_dials.html http://www.srl.caltech.edu/ACE/ASC/DATA/level3/summaries.html To monitor the...
  3. V

    Figuring the location of the sun

    Does anyone know a good way to figure out where the sun is going to be around NYC on a specific day, throughout the day? I need to draw a diagram. I found a handy sun schedule on the U.S. Naval Observatory Astronomical Applications Department website, but I need more specific info than that...
  4. B

    Density of the sun as a white dwarf.

    Homework Statement In about 5 billion years, at the end of its lifetime, our sun will end up as a white dwarf, having about the same mass as it does now, but reduced to about 15,000 km in diameter.What will be its density at that stage? g/cm^3 Homework Equations D=m/v 4/3(3.14)r^3...
  5. D

    Schwarzschild Metric: The Sun

    In 1916 Schwarzschild wrote down his famous metric to solve (or re-solve using a polar coordinate system) the precession of the perihelion of Mercury. The curvature of spacetime described by the Metric is for any non-rotating spherically symmetric mass. ds^2 = -(1-\frac{2M}{r})dt^2 +...
  6. Buckethead

    Speedy ship flies through the sun

    If a ship was traveling from afar toward our sun at 99.9999... C and skimmed the outer shell of the sun and continued on, would it burn up? From inside the ship, the trip through the shell might take a billionth or trillionth of a second, hardly enough time for the interior of the ship to heat...
  7. I

    Why does the sun have non uniform distribution of magnetic fields?

    I recall the non uniform distribution of magnetic fields is the reason sun spots occur. Why are sun spots more predominant about the equator as well?
  8. I

    Why does the sun travel faster about its equator?

    Would this be valid for all other planets as well?
  9. S

    How long until the Sun becomes a black dwarf?

    How long after the Sun becomes a white dwarf will it be until it becomes a black dwarf?
  10. M

    Do Planets Orbit Closer to the Sun Over Time?

    Just a quick question Are the planets totaly locked in there orbits forever or do they slowly get drawn in closer to the sun?either by the sun's gravitational pull or simply by the sun expanding? Thanks in advance for any replys mike
  11. P

    Earth's Elliptical Orbit around the Sun

    By just knowing the clues like the force of attraction between two masses and angular momentum conservation principle , linear momentum conservation principle and geometry..can we derive the trajectory of the Earth around the sun is ellipse..if so please tell me your ideas..
  12. V

    Why does the earth and the sun and other planets have gravity?

    This might sound like an unoriginal question but what is gravity? Why does the Earth and the sun and other planets have gravity? Does everything have gravity? What causes gravity? Thanks ahead of time :smile:
  13. T

    Finding the apparent magnitude of the sun, and finding Distances from it.

    Homework Statement During its lifetime a massive star converts about one solar mass of hydrogen into iron in its core, releasing about 0.7 percent of the rest-mass energy in the form of radiation. When it explodes as a supernovae, the outer envelope of the star (with a mass of 10Msun, say)...
  14. S

    Solid Angle of the Sun Derivation

    I read in a paper the following passage: "We take the sun to subtend a linear angle of 32 arc-minutes. The solid angle is derived as \Omega=\pi sin^{2}16'=6.8x10^{-5} sr" I don't understand how the formula to go from linear angle to solid angle is just found by taking the area treating...
  15. G

    Gravity at a spot between the Earth and the Sun Summing to 0.

    I had a friend who told me that there is a distance between the Earth and the Sun which the components of gravity add to zero. Is this true? If so, does this mean that something could get stuck there in that spot?
  16. L

    Calculating Earth's # of Rotations Around the Sun

    I'm doing physics of uniform circular motion, while I'm working out this equation It occurred to me , is it possible to find out how many rotations of Earth around the sun until it hits the sun. By the way I'm at a very NOOB level lol but seriously? *thinks of possible equation* :( not...
  17. N

    The intensity of the Sun and heat on Earth

    Hi all. Is the explanation for the fact that it is hotter at equator than other places at the Earth that the intensity of the Suns waves are greater at equator, since the number of beams per area is larger (since they are not scattered that much because of the lack of curvature)? I hope...
  18. M

    Answer: Declination of the Sun - Spring Equinox

    Hi, This might sound like a simple question, but it's not for me. I'm standing at the Tropic of Cancer - what would be the declination of the Sun on the Spring equinox. I believe it should be zero degrees, but my brother says it's 23.5 degrees. Can anybody shed light? Thanks in advance...
  19. I

    How Do the Sun's Layers Differ in Energy Production?

    Homework Statement Using the table that follows, justify dividing the interior of the Sun into two separate functional layers (as regards energy production) and describe the average properties of those two layers.http://img26.imageshack.us/img26/8356/er3z.jpg Homework Equations R/R0...
  20. R

    Gravitational binding energy of the sun?

    Could anyone give me a figure (in joules/kilo joules) for this? Wikipedia says (on it's gravitational binding energy page) that the gravitational binding energy of a star is equal to about two times it's internal thermal energy. I looked for "internal thermal energy" and could not find...
  21. M

    What is the percentage of heavy element of the sun?

    what is the percentage of heavy element (heavier than helium) of the sun? (not the photospheric composition)
  22. T

    Calculating the Period of a Planet Orbiting the Sun

    Homework Statement A planet moves in an elliptical orbit around the sun. The mass of the sun is M_s. The minimum and maximum distances of the planet from the sun are R_1 and R_2 , respectively. Using Kepler's 3rd law and Newton's law of universal gravitation, find the period of...
  23. O

    Is the Sun Anchored? | Experiments & Feedback

    By "Is the sun anchored" I am referring to its place relative to the planets. I am pretty sure the answer is yes, as the planets also exert a gravitational force upon the sun (Newton's third law). This would cause the sun to "move" somewhat, no matter how small the force exerted. Then again...
  24. qntty

    How can I track Earth's distance to the sun on a specific date?

    A few weeks ago I saw a web page (I believe it was at NASA) that allowed you to enter a date and see Earth's distance to the sun on that date. I searched but can't find the site again, does anyone know where I can find this page?
  25. F

    Angular momentum of the sun and a white dwarf

    Homework Statement The Sun rotates about its own axis once every 26.0 days. Its mass is m_sun = 2.0E30 kg and radius is r_sun = 7.0E8 m. Assume that the Sun is a solid sphere with uniform density. Astrophysicists predict that the Sun will collapse into a white dwarf in some billions of...
  26. M

    Harnessing Gravitational Energy: A Power Source Abundant Throughout the Universe

    In the world we live in, we can convert and use energy in the form of radiation and turn it into a significant power source. Gravitatoinal energy, which exists throughout the whole universe could be used someday as a power source. Think of it. A power source abundant throughtout the universe...
  27. P

    If the sun were to approach the earth

    ... as the sun was traveleing at a closer distance towards the Earth , would Earth bound objects start to fly away from the Earth surface and head towards the sun's surface , or would everything on Earth surface fly towards the sun's surface as the same time the Earth itself flew towards the...
  28. D

    Would the removal of the sun result in a shockwave?

    Hello everyone, good day, So I understand that gravity travels at the speed of light and such. So naturally, if the Sun were suddenly gone, it'd take ~8 minutes for us to fly off and die. But I was reading Michio Kaku's "Parallel Worlds" and he used the trampoline/bowling ball analogy for...
  29. B

    Where does the sun rise, w/ axial tilt?

    Obviously we all know the sun generally rises in the east and sets in the west. But due to axial tilt, it is only really due east and due west at the equinoxes. At other times of the year, the sunrise will be somewhat north of east or south of east (and likewise for the sunset, but let's focus...
  30. C

    Integrating dP/dr over the Sun

    Homework Statement Consider the Sun to be a sphere of hydrogen gas of uniform density equal to its average density (1440 kg/m3). a) Integrate the equation of hydrostatic equilibrium for dP/dr from the Sun’s radius to the core to estimate the central pressure in Pa and in atmospheres...
  31. T

    Any relationship between light from the sun and electricity?

    I have a Van der Graaff machine here. When I touch it with my finger I get zapped by a big blue spark. Does this spark of light have any relationship or commonality with the light I see all around me from the sun? If not, can someone please try to convince me that it does...
  32. D

    What is the Electric Field Strength of the Sun?

    Sorry if this is the wrong forum (its difficult to tell) What is the electric field strength of the Sun, how is it measured and what is its origin? Thanks
  33. B

    How does the 'atmosphere' of the sun affect ligth from stars passing behind it.

    When the sun goes down over the horizon, we can still see the sun because the light of the sun is bent by our atmosphere. I would imagine that if one were outside of our atmosphere on the far side of Earth away from the sun, yet in a path in line with that light they would also see the sun...
  34. A

    Calculating Final Speed & Energy of 0.1 Solar Mass Falling into the Sun

    Homework Statement (b) If an object of 0.1 Solar masses fell into the Sun (starting at rest at infinity) calculate what its final speed and energy would be. Mass of the Sun = 1.99 x 10^{30} kg Radius of the Sun = 6.96 x 10^8 m The Attempt at a Solution Having done the rest of...
  35. I

    How long does it take the Sun to melt a block of ice

    Homework Statement How long does it take the Sun to melt a block of ice at 0 celcius with a flat horizontal area 1.0 m^2 and thickness 1.0 cm ? Assume that the Sun's rays make an angle of 30 with the vertical and that the emissivity of ice is 0.050. Homework Equations delta [Q] /...
  36. Philosophaie

    Elliptical orbit around the Sun

    Why do the planets travel in elliptical orbit around the Sun?
  37. S

    How do you see the sun after it has set?

    How do you see the sun after it has set?? Homework Statement The density of the atmosphere decreases with height, as does the index of refraction. Explain how one can see the sun after it has set. Homework Equations Snell's Law: sin x1 * x1 = sin x2 * x2 The Attempt at a...
  38. G

    Why at the south hemisphere the sun rises from the west?

    Hello I wanted to ask why at the south hemisphere the sun rises from the west? We know that Earth rotates reversely than the watch pointers(this happeness to both hemispheres),so all the "sky" (the stars etc..) goes to the opposite direction. If someone could explain me.. Thank you!
  39. Helios

    Ecliptic Longitude and Right Ascension of the Sun

    Here's a question. Where do the ecliptic longitude and the right ascension ( of the Sun )reach their maximum difference? What is the declination for these events? What calendar dates do you suppose this happens? I know the answer. I've never heard anyone make this observation except me. These...
  40. Philosophaie

    Dipole Moments of the Planets and the sun

    I am wondering if there is a source of the magniude of the Dipole moments of all the planets and the sun, m. m(earth) is 8*10^22 A*m^2. The Magnetic Field and the Electric Field such that: Br = Mu0/4/pi*2*m*cos(Theta)/r^3 Btheta = Mu0/4/pi*m*sin(Theta)/r^3 Mphi = 0 Er =...
  41. Philosophaie

    Find Longitude of Sun - Learn How Now

    How do you know where the Longitude of the Sun begins?
  42. Philosophaie

    Calculating the Earth's Elliptical Orbit around the Sun

    To help me you will need tho know Excel VBA very well. Earth has an elliptical orbit around the sun. JPL's website has the data to calculate this orbit: http://ssd.jpl.nasa.gov/txt/p_elem_t1.txt In the spreadsheet the parameters are calculated from widely used equations and some of my...
  43. H

    Hurricane size whirlpool on the Sun

    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
  44. S

    Is the Sun Dying? | Facts & Speculation

    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.
  45. C

    Specific Energy Generation of the sun.

    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...
  46. K

    Estimate the Time for the Sun to Disappear Again

    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...
  47. F

    Find Length of Sun Mass in km: Solving G, c, M Units

    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...
  48. S

    Comparing Light Intensity: 100W Bulb to Sunlight

    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...
  49. B

    Is the Pioneer Anomaly really directed towards the Sun ?

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

    Asteroid in a circular orbit about the Sun

    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.
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