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.

View More On Wikipedia.org
Recent contents Top users
  1. J

    Period of a planet orbiting the Sun

    Homework Statement A planet P orbiting the Sun S is acted upon by a force F= -(mu*r)/r3 (itex won't work here for some reason :S ) per unit mass where \mu is a positive constant and r is the vector \stackrel{\rightarrow}{SP} If the orbit of the planet is a circle of radius a, show that the...
  2. B

    The weak force, first step of nuclear fusion in the Sun

    Hi. I need help please with a textbook illustration that has confused me. Is the caption a typo? Should be "neutrons into protons" instead? Thanks.
  3. S

    Programming the forces the sun applies on earth

    Hey guys, I am trying to create a 2d simulation of the Earth going around the sun. However I am facing an issue. I am not sure what are the forces that apply on the Earth in a 2d aspect. I know there is the gravitational pull GM1M2/R^2. I know there is momentum, which is P = V * R...
  4. X

    How long will the sun burn if only combustion is happening.

    Homework Statement The sun has a mass of 2*10^30kg and gives off energy at a rate of 3.9*10^26 watts. If the source of the sun's energy energy were ordinary combustion of methane how long will it last. Homework Equations delta Enthalpy of the combustion of methane is -802 kj...
  5. C

    A comet revolves around the sun

    Homework Statement A comet revolves around the sun in a closed elliptical trajectory. Ignore any force acting upon it besides gravity. Prove that the angle between the position vector (sun in the origin) and the velocity vector of the comet at its perihelion and aphelion is 90º. The...
  6. J

    Exploring the Layers of the Sun Emitting Radiation

    I'm trying to figure out which layers of the sun emit different types of radiation For instance; I know that most of the visible light is emitted from the photosphere but what about IR, UV, x-ray, etc...? Anyone know?
  7. T

    How much will be the gravity of the sun if i make it like a stick

    If i rip the sun and make it into tiny packets, a size of about a normal house and then align it in a straight line, each box having 10 cm separation, then how strong will be the gravity at the end of the line? Will it have gravity stronger than a normal sun?
  8. E

    Sun Emission Spectrum: Redshift/Blueshift & Visible Light

    Is the rather continuous spectrum of the Sun due to redshift/blueshift of the radiation emenating from the Sun? I understand that the emission spectrum of Hydrogen in the visible range is quantized to four discrete values, but I'm trying to understand how all frequencies of visible light are...
  9. K

    Would the outer planets in our solar system survive a supernova event?

    Now I know the sun can't go supernova ever, but let's say the sun somehow acquires enough mass to eventually undergo a supernova with an energy output of one foe, what would happen to the solar system? Would the outer planets such as the gas giants and pluto survive?
  10. B

    Spectral radiance of the sun for 400nm

    Homework Statement Using Planck's law, calculate the spectral radiance of 400nm sunlight arriving at earth. Assume 1/3600 steradians of view and 5800 K of temperature. Homework Equations Planck's law The Attempt at a Solution I am not the best at typing formulas. Lets...
  11. O

    Can electric fields/currents be seen on the sun?

    My understanding is that fluid dynamics in the convective zone generate electric fields and are what drives the magnetic fields which are then pushed up into the photosphere by differential rotation. Question is are electric fields or currents also present in the plasma filled magnetic and...
  12. K

    Astrophysics: Number of pp-reactions occuring in the Sun

    Homework Statement Calculate the number of proton-proton reactions that occur in the Sun each second. For simplicity consider only the energy generation produced by the PPI chain. Consider that the Sun produces its energy in a steady state from the pp chain. Homework Equations...
  13. J

    Radiated Energy from the Sun: Is It Diminishing?

    Is the radiated energy that reaches the Earth from the Sun diminishing? Some meteorologists think it is due to the reduction of Sun spots. Is this the normal 11 year cycle, or is there more to it?
  14. A

    Is it possible for the earth to come off orbit and crash into the sun?

    Or get so close that human life will be destroyed
  15. T

    Can a Gamma Ray Burst create a shadow on Earth from the Sun?

    Would a nearby Gamma Ray Burst (GRB) cause the Sun to cast a shadow on Earth if it were to shine from behind it?
  16. 1

    Predicting the Radius of the Sun as a Red Giant with SSM

    How can SSM be utilized to predict the radius of the Sun when it becomes a red giant?
  17. K

    Is the Sun Really White? Investigating a Crackpot Theory

    Hey! Some time ago i saw this video: [crackpot link deleted] And, although I'm a comp sci guy and did studied physics on the first two years, i could say i have almost none knowledge of physics, i mean, real knowledge, not just how to make my guy jump on a 3D game. I wonder if this guy is just...
  18. S

    How Do You Calculate the Sunset Time on the Winter Solstice at 40 Degrees North?

    Hi everyone, new member here. Anyway, for my astronomy class my professor wants us to calculate the zone time the center of the sun sets on the winter solstice, at 40 degrees north latitude, and I'm a bit stuck. I know on the winter solstice, the declination of the sun is -23.5 degrees and the...
  19. G

    Mass Lost by the Sun by emitting radiation

    Hi, I recently did a homework problem for my introductory Quantum Mechanics course and in the problem we were given the sun's temperature in Kelvin as well as the diameter of the sun and instructed to calculate the rest mass lost per second to radiation by the sun. I was able to solve the...
  20. E

    Distance to the Sun using Venus transit

    Hi! I was wondering if anyone of you know how to calculate the astronomical unit 1 AU, using data from a Venus transit and not using the parallax method. I already have all the data from the 2012 transit; the time it was in phase 1 when it contacts the Sun's disk and when it leaves the disk...
  21. J

    Will the Earth survive the Sun becoming a red giant?

    Is it likely that the Earth will survive or more likely that it will be engulfed?
  22. davenn

    More garbage science reporting about the sun

    a few days ago another member posted a thread about the Fox new report on a chunk of the sun flying towards Earth here's yet another news item one an Australian online news site... Sun's magnetic field about to flip Aug 07, 2013 8:34am NO, it doesn't happen every 11 years on and NO it...
  23. P

    Nuclear Fusion process in the Sun (or generally, any star)

    Why can't the Sun (or any star) fuse elements higher than iron? Could anyone provide a technical answer? Thanks!
  24. J

    A part of the sun broke off and is headed our way

    http://video.foxnews.com/v/2574867146001/nasa-spots-giant-dark-hole-in-the-sun/ Say goodbye everyone :(
  25. P

    How does quantum tunneling enable nuclear fusion in the Sun?

    I know that the Sun radiates vast amounts of energy partly due to nuclear fusion. I've also heard that nuclear fusion can occur in the Sun due to quantum tunneling. I'd like to know how the process of quantum tunneling in the Sun allows nuclear fusion to take place. Thanks!
  26. Philosophaie

    Metrics for the Sun & Earth: Rs & Assumptions

    Is there a Metric for the Sun and Earth other than the Schwarzschild Metric who has the Schwarzschild Radius on the interior of the body? What are the assumptions that turn that from GR to Newtonian? Rs(Earth)=8.87*10^-3m Rs(Sun)=2954m
  27. J

    Is It Possible to Destroy the Sun with Just a Beam of Energy?

    Hello, New here, hoping to get some answers... So here's my dilemma, me and my friend are having this debate. He claims that a beam of energy, of any size, even smaller than an ant, should be enough to destroy the sun. His theory is that, if the beam carries enough energy to rival the...
  28. A

    How to find the point between Mercury and the Sun so force = 0?

    Homework Statement Find the point between Mercury and the sun at which an object can be placed so that the net gravitational force exerted by Mercury and the sun on this object is 0. Homework Equations Mass of sun = 1.991 x 10^30kg Mass of Mercury = 3.18 x 10^23kg distance between...
  29. B

    Gravity moving toward the center of the Sun?

    Gravity moving toward the center of the Sun?? Ok can someone tell me if I am wrong in my understanding here (in a heated debate with a physics professor) : As you move from the surface of the sun to the center, does the force of gravity increase or decrease and why? The point I am trying to...
  30. T

    Is the Sun invisible at relativistic speeds? Part II

    ^^This is how the Sun would look from a distance of 4 light-years. If you add all the relativistic effects and stuff, wouldn't the Sun disappear from the visible spectrum? I was told that from a mathematical point of view, it is correct to say that some visible photons would still reach you, but...
  31. T

    Is the Sun invisible at relativistic speeds?

    At which speed does the Sun disappear from the visible part of the spectrum if I were to travel towards it at high speed? Let's assume there are no other stars in the visible universe and I'm a few light-years away.
  32. K

    Why wouldn't the Earth gravitate towards the Sun?

    Hello. Why wouldn't the Earth gravitate towards the Sun? I have done some online research on this question and it appears that the reason is due to the Earth's rotation. I am not convinced and see no reason why that should be the reason. According to the Rutherford's model of the atom, an...
  33. R

    Earth's axial tilt and the shadow from the Sun

    I have watched the Sun's shadow make its trek from the solstice moments for many years. I have it marked and like to observe it as Earth's tilt reaches it's maximum point, from Summer to Winter and back. I used a heliodon to built a large structure (80 feet long/12 feet tall=roofline of my...
  34. nsaspook

    NASA SDO: 3 Years of Solar Images

    Three years of images from NASA’s Solar Dynamics Observatory (SDO). http://svs.gsfc.nasa.gov/vis/a010000/a011200/a011255/
  35. S

    Why Does Light Take 8 Minutes to Reach Earth from the Sun

    Question: Light experiences zero time and zero distance so for a photon it must be here and there at the same instance. As the moment a photon is created it must be at position A and B at the same moment. So for a Photon it takes zero time to reach Earth from the sun. Why do we then see...
  36. Y

    The Earth as pendulum tied not to the Sun

    The thought came to my mind yesturday : does not Earth in its movement looks like pendulum tied to the Polaris ? Only the very long one - comparable to an object swinging about 1 cm circle at a tie of about 15 000 km (if my quick calculations now are correct).
  37. T

    Time taken for earth to orbit the sun?

    Are we just really lucky that the time it takes for Earth to orbit the sun is 365.25 days? I mean if it was something like 365.71 days, then we couldn't have our simple leap year every four years. We would have to have a 71 leap years every century, or even if we were to simplify it a bit, 7...
  38. Anna Blanksch

    How does the sun burn without oxygen?

    On Earth, fire needs oxygen. If space has no oxygen, how does the sun continue to burn? Thanks! :) Ω
  39. L

    Estimate the central temperature of the Sun

    Homework Statement Homework Equations The Attempt at a Solution I'm only stuck on part b). I make a) to be 3.87E26 W, but it gives that anyway in part b). OK, so here's my attempt: \int_{r=0}^{r=R}dT(r)T(r)^3 = -\frac{3L(r)}{16\pi acl_{mfp}}\int_{r=0}^{r=R}dr\frac{1}{r^{2}}...
  40. E

    Questions about Nuclear Fusion in the Sun

    This excerpt is from "The Universe and the Atom" by Don Lichtenburg: I was under the impression that photons made in the nuclear fusion bounced off of particles for a long time, before they inexplicably were able to escape from the sun. Why does the sun absorb the most energetic photons...
  41. A

    How does the earth exert gravitational pull on the sun

    Homework Statement My physics teacher today said that the Earth exerts the same amount of gravitational pull on sun;as the sun exerts on the earth. Is this really true? Homework Equations There is no equation. The Attempt at a Solution I am very confused with this. How can the...
  42. D

    When did nuclear fusion in the sun really start ?

    - possible sun timeline - 3,130,000 years for molecular gas to condense into protostar - 40,000,000 for core to condense and heat up to 15 million K - 43,130,000 total - sun has only enough matter to 'burn' by gravitational pressure for 100/300 million yrs - first stage of...
  43. J

    The time it takes the Earth to go around the Sun.

    I used this equation to find the time in seconds for the Earth to complete 1 orbit around the Sun. p=2\pi\sqrt\frac{\alpha^3}{\mu} I put in 149598261000 metres for the semi-major axis, and 1.33E+20 for the gravitational parameter. I got 3155391.8 seconds for the period. This I believe...
  44. H

    Earth's centripetal acceleration around the Sun

    Homework Statement The Earth has a mass of 6 x 10 24kg and orbits the sun in 3.15 x 10 7 seconds at a constant circular distance of 1.5 x 10 11 m. What is the Earth's centripetal acceleration around the Sun? Homework Equations The Attempt at a Solution
  45. xpell

    Orbiting the Sun beyond the Hill sphere

    I was wondering if a spacecraft (or any other object) could 'co-orbit' the Earth by orbiting the Sun beyond our Hill sphere. For example, could this object 'hover over' the North (or South) Pole at >1,500,000 km? Thanks in advance!
  46. H

    Creating a Equation to Destroy the Sun

    Alright, Not the best at math and need help with find a equation for the amount of energy needed for destroying the sun. This isn't based on real life, based on a TV series and I'm nerdy enough to want to know how much energy it would take lol. I have a number for how much energy it would take...
  47. P

    What is the heat current from the sun to a unit area on Earth?

    I'm recently studying heat transfer processes. I saw that the heat current emited by a radiating body is given by: \frac{dQ}{dt}=H=A e \sigma T^4 I was wondering how to calculate the H from the sun to a unit area here on earth. How should I do it? I've seen exercises where they use this...
  48. B

    Discovering the Sun's Mass: Calculating Without AU Distance | Wikipedia Method

    1/ when serching for mesurement Earth-Sun distance, I got this in the sechon answer, to use this method, we need mass of the Sun but when I searched for Sun' mass http://en.wikipedia.org/wiki/Solar_mass 2/ r=GMT^2/(4(πr)^2)The Attempt at a Solution there are the other ways to caculate Sun...
  49. S

    How can I show the sun rotates?

    Hi guys, can I say that since the sun orbits around the centre of mass of the solar system, it has angular momentum L=mvr. And since L=Iw, the sun itself will rotate about its own axis. Am I right to say that? However, conceptually speaking, is there a reason why the sun rotates? Also, what...
  50. S

    Determine the relative distances of each of the planets from the Sun given [ ].

    "Determine the relative distances of each of the planets from the Sun given [...]." Homework Statement Devise methods to determine the relative distances of each of the planets from the Sun given the information available to Copernicus (observable angles between the planets and the Sun...
Back
Top