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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
How hot can metal get in sunlight? - Physics Stack Exchange I will make some 5mm blackened steel letters for a building Now, in the sunlight in summer, how hot can they get? EDIT: i want to place some LEDs on the back of the letters now the question is
sun - Nuclear fusion - Hydrogen isotopes - Physics Stack Exchange What is the isotope composition of hydrogen atoms in the sun? Are the ratios of protium:deuterium:tritium similar to those we find on earth? What does the nuclear fusion of hydrogen atoms in the sun
Black and white matters. But why and how? - Physics Stack Exchange So a metal door in the sun will transfer the heat of the visible spectrum to the interior if painted black, will reflect it back and keep the interior cooler if painted white It is a good reason for painting roofs and walls white in hot countries A white car is also better in hot countries for this reason
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 heat ca
Why does the Sun always rise in the East? - Physics Stack Exchange The Sun does not rise, it is the horizon that goes down You say that Sun rises in the East (with a certain degree of oscillations due to the tilt of the axis) just because the Earth spins from West to East The revolution affects the difference between sidereal time and solar time, and makes the solar day ≈ 4 ≈ 4 minutes longer If the Earth spinned in the opposite direction the Sun would
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
Is it possible to land on sun? - Physics Stack Exchange The Sun is, of course, quite hot A space probe built by normal materials probably would melt or burn even it’s still quite far from the Sun However, from a theory point of view, is it possible to