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. L

    What energy does the sun produce?

    Homework Statement What types of energy does the sun produce? Homework Equations N/A The Attempt at a Solution I feel stupid..but I think it produces Light energy as well as Solar Energy? Does it produce Light Energy?
  2. R

    What Would Happen if a Gamma Ray Burst Hit Our Sun?

    I enjoy asking myself random questions and then finding the answers online i.e. forums however, I could not find the answer to this one. What would happen if a gamma ray burst hit a star or specifically our sun?
  3. S

    Observing the image of the sun (optic)

    Homework Statement Hi everyone, I was wondering if anyone can help me out with my project in physics. Our goal is to make the sun image appear on a panel at the end of a rail, using lens, to see if we can observe sunspots on the projected image of the sun. This is the materials we have...
  4. G

    Angular Momentum of a Comet Around the Sun

    Homework Statement (a) A certain comet of mass m at its closest approach to the Sun is observed to be at a distance r1 from the center of the Sun, moving with speed v1. At a later time the comet is observed to be at a distance r2 from the center of the Sun, and the angle between rvec2 and the...
  5. K

    Calculate the rotational kinetic energy of the Sun in joules

    Homework Statement Assume the Sun is a uniform, rigid sphere (it is spherically shaped but actually is not of uniform density nor a rigid body). The Sun rotates once every 27 days. (a) Calculate the rotational kinetic energy of the Sun in joules. (b) The luminosity (power output) of the...
  6. W

    Calculate the neutrino flux from the sun

    Homework Statement Every reaction in the sun has the energy equivalent to 0.03 mp, and generates 2 neutrinos per reaction. Calculate the number of neutrinos per second, and calculate the neutrino flux at Earth. Astronomy generally uses the CGS (centimeter gram second) system, so just be...
  7. B

    Sun Losing Mass due to Energy Radiation

    Homework Statement Energy from the sun (distance 1.496 x 10^11m from earth) arrives at the Earth at a rate of 1400W/m^2. How fast is the sun losing mass due to energy radiation? Homework Equations The Attempt at a Solution Ok so i thought that Ei = E/r^2 where Ei is incident...
  8. T

    Distance between the sun and earth

    is the distance between the sun and Earth the same as the distance between the moon and the sun?
  9. F

    The Mystery of White Light from the Sun

    why is the light from the sun called white light?
  10. D

    What is the Equation for Calculating the Mass of the Sun?

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  11. Sirsh

    Finding the mass of the sun from T^2/R^3

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  12. T

    Gravitational force of the sun on earth

    Homework Statement Consider the system of the Sun, Earth, and Moon, at a moment in time when they happen to be exactly in a line. (Assume that all distances d are measured between the centers of all bodies, and that all distances d are much greater than the radii of all bodies. M(sun) =...
  13. T

    Could my I.R lowpass goggles work without using light from the sun?

    For this science project I'm doing, i am going to be investigating the I.R Lowpass (a.k.a: Near infrared spectrum) with goggles i shall soon be constructing based on http://www.youtube.com/watch?v=H2-nP2xl9Zg&feature=player_embedded" This question may be a bit silly but will my goggles work...
  14. J

    Changing Earth's Orbit: How Has the Speed Around the Sun Evolved?

    I understand that the Earth takes 365 days (give or take) to orbit the sun. I also understand that the physics of the universe are in continual flux (expanding universe, cooling suns, etc). Question: Is it plausible to assume that the Earth took a shorter/longer time to orbit the sun a...
  15. W

    Object from the sun at half light speed

    Hypothetical question: Imagine that a massive object large enough to observe with a powerful telescope was ejected from the sun and began traveling toward earth. It would take about 8.3 minutes for the light from the sun to reach Earth so we could observe the initial event. Let's imagine...
  16. T

    Inertia and Kinetic energy of the sun

    Homework Statement Ive been trying to find the Inertia and Kinetic energy of the sun. I have a feeling I am using the wrong formulas to obtain the answer. Mass of sun 2*10^30kg Radius of sun 700*10^6 m t spin = 26 days the answers should be I = 4.0 * 10^98 K energy = 1.5 * 10^16 Homework...
  17. B

    An asteroid is orbiting around the sun at a distance of 4.2

    An asteroid is orbiting around the sun at a distance of 4.2  1011 m. If the Earth orbits around the Sun at a distance of 1.5  1011 m with a period of 3.2  107 s, what is the period of the asteroid?
  18. B

    Weight decreased by the combined pull of the sun and moon?

    Homework Statement at a moment of total eclipse the moon lies in a straight line from the Earth to the sun. If your normal weight is 600N how much is your weight decreased by the combined pull of the sun and moon? [b]2. Homework Equations Mass of sun - 2.0x10^30 kg distance from...
  19. M

    How Long Does It Take a Comet to Travel 80 Degrees Around the Sun?

    Homework Statement A comet passes the sun at a distance of closest approach R = 6 * 10^8 m and speed 8 * 10^5 m/sec. How long will it take to travel 80 degrees around its orbit from the point of closest approach. Homework Equations omega = velocity / radius The Attempt at a...
  20. O

    Speed of a comet around the sun.

    Homework Statement A comet is in an elliptical orbit around the Sun. Its closest approach to the Sun is a distance of 4.5e10 m (inside the orbit of Mercury), at which point its speed is 9.6e4 m/s. Its farthest distance from the Sun is far beyond the orbit of Pluto. What is its speed when it...
  21. P

    What is slowness of the sun in computing azimuth angle?

    what is "slowness of the sun" in computing azimuth angle? Homework Statement The question is to calculate the azimuth angle for a city and to use the analemma diagram to estimate the "slowness of the sun." Homework Equations The Attempt at a Solution I need to know what slowness...
  22. W

    Why are there Magnetic Fields on the Sun?

    Pardon this completely naive question. I am wondering why there are net magnetic fields on the Sun. Isn't there an equal number of protons - hydrogen nuclei - to electrons? Is there a separation of protons and electrons in different parts of the Sun so that there can be net currents? or are...
  23. F

    How Does the Sun's Motion Appear from Earth's Perspective?

    Ok, so the sun appears to move westward on a daily basis. But eastward through the stars on a yearly basis. I am supposed to explain both the daily and yearly motion of the sun using a few paragraphs with definitions and diagrams. For the year I basically have to explain and draw the sun's...
  24. D

    Linear velocity at equator with respect to the sun

    Homework Statement What is the linear velocity of a persion standing at the Earth’s equator with respect to the Sun, when the Sun is just at the Eastern horizon? Homework Equations Not sure, I used to v=d/t to solve for a person's linear velocity at the equator, just not sure how to handle...
  25. C

    Sun Expansion: What Would Humans Do?

    Hello! I'm new here, and I don't honestly know anything about astrophysics, so I'm sorry in advance for the upcoming questions and would like to ask you to be as elaborate and as simple as possible. So, if the sun expands, when do you think this will happen? If Earth is still alive, what do you...
  26. B

    How Do You Calculate the Mass of the Sun Using Orbital Mechanics?

    Use your average value of G to estimate the mass of the Sun. Assume that the orbit of the Earth around the Sun is circular. The orbital radius of the Earth on its path around the Sun is R=1.5X10^11 m and the Earth needs 365.25 days for one full orbit. You need to provide detailed steps how you...
  27. S

    How Far is Phobos from the Sun?

    Homework Statement Phobos is the larger and closer of Mars’s two moons. It has no atmosphere, a mean radius of 11 km, an albedo of 0.07, and an emissivity of 1.0. (i) Assuming that the radiative temperature of Phobos is 222 K and that it is spherical, what is its mean distance from the...
  28. Z

    Density distrubution and solar lifetime of the sun

    Homework Statement Kelvin could only see the photosphere (the glowing outer surface) of the sun, so didn't know how the mass was distributed inside it. How would the potential energy of the sun change if it was a hollow shell? (No numbers needed; just indicate whether it would be more or...
  29. P

    What elements are present in the sun and how do they form?

    I was reading something the other day on spectral readings from the sun, and I have a few questions regarding its composition. I know that there are heavier elements (gold, uranium, etc.) in the sun. I'm confused by this, as I didn't think there was enough energy to form such elements. My...
  30. J

    Changes in planet orbits as a star (eg. the Sun) decreases is mass.

    Hi, I'm actually a Design Engineer but I find the topic of Relativity extremely interesting and I was wondering if somebody could give me some guidance on this. If Planets and Stars (due to their mass) 'warp' Space-Time then this means that our Sun distorts the fabric of space just like a...
  31. B

    Energy from the sun that reaches the earth

    The sun consumes about 600 million tons of matter per second, How much energy is that? Of this energy how much reaches the surface of the earth E=mc^2 I solved the first part, but how do I start the second?
  32. W

    If the sun suddenly dissapeared.

    I have a question about this known hypothetical situation. Einstein asserts that once the sun vanishes we would still receive light for 8 min. Then at almost/same time when the sky goes dark, the gravitational wave hits Earth and we would fall out of the earlier orbit around the sun. Some...
  33. I

    Calculate Energy Prod. in Sun, Hydrogen Consumption & Burning Time

    The radiation flux from the sun at the top of the Earth's atmosphere is 0.139 J cm-2 s-1 at normal incidence. The Earth is 1.50x108 km from the sun. Calculate: (a) the energy production in the sun in MeV/s (b) the rate of hydrogen consumption in g/s (c) how long hydrogen-burning can continue...
  34. M

    Does the sun have angular momentum?

    That's pretty much it. Is it perfectly spherical, or is it squashed like the Earth due to a rotation? Is it rotating through an axis perpendicular to the plane of the solar system? If yes, can we measure this using Doppler shift of spectral lines either side of the sun, or something like...
  35. G

    Can the sun be blueshifted due to Earth's rotation?

    I used my telescope and a Solar filter to take a shot of the sun and on the bottom half of the circle (due to the mirrors inverting the image) there is a blue outline and on the other side is a red outline. Is this a display of the dopplar effect or just a coincidince?
  36. K

    Angular Momentum Conservation in Planetary Orbits

    If you were to measure the area of a sector that a planet would sweep out in one week around the sun. It would be the same no matter what time of the year it was. What conservation principle is this example demonstrating? Linear, angular or both? and why?
  37. E

    In 4-D, the Earth orbits around the sun in a straight line

    "in 4-D, the Earth orbits around the sun in a straight line" someone told me that in 4-D, the Earth actually orbits around the sun in a straight line, could someone try to explain to me how this is so? thank you
  38. S

    How do you find the mass of the Sun using data about planet periods and radii?

    How do find the mass of the Sun using the following data: Planet r ... T Mercury 57.9... 0.241 Venus 108... 0.615 Earth 150... 1 Mars 228... 1.88 Jupiter 778 ... 11.9 Saturn 1,430... 29.5 Uranus 2,870... 84 Neptune 4,500... 165 Pluto...
  39. Y

    Coriolis from our orbit around the Sun

    Can we detect any coriolis forces induced from our circular orbit around the Sun ? We're going in a big circle so we should be able to detect some coriolis if we deviate from that circle - ie if we move around a bit instead of following a perfect circular path. Considering the Earth is...
  40. P

    Why doesn't the Earth collide with the Sun?

    I am in AP Physics and we just got done with Centripetal force and Universal Gravitation. I was wondering since for the planets to stay in motion they need to have the same force as the object they are orbiting around. Since a bigger mass means a bigger force, how does the Earth stay in motion...
  41. M

    Finding the Temp of the Sun given only 3 variables.

    Homework Statement This is for my Optics class: Given the radius of our planet, its temperature, and the distance to the Sun, estimate the temperature of the Sun (hint: use the Stephan-Boltzmann law). Homework Equations Radius of Earth \widetilde{=} 6,378.1 km Temperature of the...
  42. Spinnor

    Energy and momentum flux in the sun and Newton's 3rd law.

    Newton's Third Law of Motion: III. For every action there is an equal and opposite reaction. Photons in the sun on average travel outward, electrons and ions on average recoil inwards? Does Newton's third law come into play here? Thank you for help with my confusion.
  43. J

    How Many Photons Does the Sun Emit Daily?

    Homework Statement The sun emits 3x1032J of energy every day. Assume it emits only yellow light (6x10-7m wavelength. a. What is the energy of each photon of yellow light? b. How many photons does the sun emit every day? Homework Equations E = hf The Attempt at a Solution So I think...
  44. S

    Find the distance from the sun to the planet known the orbital period problem

    Homework Statement the problem asks to find the distance from the sun to a planet. the only information the question gives the the orbital period of 27 years and asks for the answer in km. Homework Equations c= (2)(pi)(r) The Attempt at a Solution assuming the planet revolves...
  45. 1

    Calculating Earth's Speed Around the Sun

    Homework Statement The Earth travels around the sun in a circle of radius 150 million km and does a complete cycle in about 365 days. Find its speed. Homework Equations v= d/t The Attempt at a Solution d = 1000m/1km x 150,000,000km = 1.5 x 10^11m There are 31,536,000 seconds in 1year. v =...
  46. B

    Please help: astronomy questions about how earth orbits the sun

    Below are some questions. I have struggled with these questions so any help would be greatly appreciated. Thank you so much. The Earth orbits the Sun: a. in a perfect circle b.in an ellipse with the sun at the center c.in an ellipse with the sun at the focus d.in a shape...
  47. G

    Angle of the Sun above orbit plane on satellite-centered celestial sphere

    I'm trying to show that for certain combinations of altitude and inclination there will be periods of the year where a satellite has eclipse-free orbits. Using a satellite-centered celestial coordinate system, in which the orbit plane is the equator and the direction of Earth is fixed along the...
  48. W

    I can't understand why the sun moves across the ecliptic

    I can't understand why the sun moves across the ecliptic :( I've been searching for hours and I've found nothing more than "because of the Earth's revolution around the sun", so I'm assuming this is extremely obvious - but I can't understand it. I understand why the declination angle of the...
  49. R

    Are there any objects between Mercury and the Sun?

    Could there be objects between Mercury and the Sun? Like, say, asteroids?
  50. M

    How Does Proton Fusion Sustain the Sun's Energy?

    Homework Statement The sun is powered by fusion, with four protons fusing together to form a helium nucleus (two of the protons turn into neutrons) and, in the process, releasing a large amount of thermal energy. The process happens in several steps, not all at once. In one step, two protons...
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