How long until the sun cannot sustain human life on earth? The sun will last, at its current brightness for 9 billion more years How long until the sun gets burned down to the point where it cannot sustain life on Earth anymore? Updated: I am more concer
Why does the Sun shine brighter some days? [duplicate] 1) The sun seems brighter (more dazzling) if there is more scattering in the atmosphere The sun would actually look very small to us in the sky if there were no atmosphere (it's the same angular size as the moon) and most of the brightness seen in the direction of the sun is from small deflection rayleigh scattering
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 uranium (b
How is distance between sun and earth calculated? Do you want to know both how the Earth-sun distance is measured and how the speed of light is measured? Those are completely different things As I asked before, separate threads, please
How do protons fuse in the sun? - Physics Stack Exchange I know that Nucelar fusion in the sun requires quantum tunneling to occur, as otherwise the Sun's core wouldn't be hot enough to overcome the Fusion barrier However while the 2nd and further stage
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 $\approx 4$ minutes longer If the Earth spinned in the opposite direction the Sun would