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  1. How much lux does the Sun emit? - Physics Stack Exchange

    I want to know how much lux the sun emits on a bright day - I don't mean when one stares directly at the sun, but rather when one walks casually outside when the sun is shinning brightly. Now the

  2. Nuclear fission in the Sun - Physics Stack Exchange

    The Sun's energy comes primarily from fusion of light elements in its core. It is estimated that a very small fraction of mass of the Sun (~$10^{-12}$ times the abundance of hydrogen) is …

  3. What is actually meant by 'sun set' and 'sun rise' times, when …

    Feb 15, 2017 · If this is the case, then when we read things like what time sun sets and rises on websites, books, calendars, other official times, et al… does that mean when we see for …

  4. How is Earth protected from the gamma rays generated by the Sun?

    The Sun is generating energy by nuclear fusion. This nuclear fusion will emit energy in the form of gamma rays. Normally, the earth's ozone layer filters the ultraviolet radiation while the earth's

  5. How much hotter will an object get if I paint it black?

    Jul 13, 2020 · The energy from the surface of that cone at the surface of the Sun is transferred to a given area of the object. On the other hand the object radiates according to its temperature …

  6. sun - Why is sunlight spectrum continuous? - Physics Stack …

    The sun's spectrum is very complex, and indeed there are a lot of "lines"—both light and dark (emission and absorption)—amidst a sea of what looks to be continuous frequencies.

  7. Why is the Sun almost perfectly spherical? - Physics Stack Exchange

    Sep 22, 2015 · The Sun has neither of these (the centrifugal acceleration at the equator is only about 20 millionths of the surface gravity, and Jupiter is too small and too far away to have an …

  8. Can Jupiter be ignited? - Physics Stack Exchange

    Our solar system itself contains two candidate "Earths" One is Jupiter's moon Europa and another is Saturn's moon Titan. Both of them have the problem of having at low temperature as Sun's …

  9. Black and white matters. But why and how? - Physics Stack Exchange

    Jul 3, 2014 · The visible has about half of the energy coming from the sun on the surface, as seen in the link. So a metal door in the sun will transfer the heat of the visible spectrum to the …

  10. Why is the Sun approximated as a black body at ~ 5800 K?

    Mar 20, 2019 · Approximating the sun as a black body effectively means that it's surface temperature is 5800K. And, indeed, if we look at the most dominant wavelength of the sun …