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How much lux does the Sun emit? - Physics Stack Exchange When you look 'at the world' (i e to the horizon) on a clear day, unlesss the sun is at a very low angle, the surface of your eye is not illuminated directly by the sun, only reflected sunlight from the atmosphere, ground and objects The 32,000-100,000 lux figure is referring to a horizontal surface illuminated directly by the sun
What would happen if Jupiter collided with the Sun? However, the Sun will accrete $\sim 10^{42}\ \mathrm{kg\ m^2\ s^{-1}}$ of angular momentum, which is comparable to its current angular momentum The accretion of Jupiter in this way is therefore sufficient to increase the angular momentum of the Sun by a significant amount In the long term this will have a drastic effect on the magnetic
How is distance between sun and earth calculated? Another way of calculating the earth - sun distance is to look at the centrifugal and the gravitational force This solution assumes that one already knows the mass of the sun, but thats a different problem ;-)
Why is the Sun almost perfectly spherical? - Physics Stack Exchange The Sun has had plenty of time to reach an equilibrium between its self gravity and its internal pressure gradient, the dynamical timescale for the Sun as a whole is only $\sim (GM_\odot R_{\odot}^3)^{-1 2} \simeq 1600$ s Any departure from symmetry would imply a difference in pressure in regions at a similar radius but different polar or
Nuclear fission in the Sun - Physics Stack Exchange It is estimated that a very small fraction of mass of the Sun (~ $10^{-12}$ times the abundance of hydrogen) is uranium (both 235 and 238 isotopes) But given the huge mass of the sun (~ $2*10^{30}$ kg), the mass of uranium in sun will come to around $2*10^{18}$ kg, which is again a significant quantity
Why is the Sun approximated as a black body at ~ 5800 K? The sun is considered a black body, not only from the perspective of the Earth but from any perspective The sun's intensity spectrum is roughly the one of a perfect black body minus absorption by the sun's atmosphere and the Earth's atmosphere depending of where we measure the spectrum See the sunlight article on wikipedia
astrophysics - Why wouldnt the part of the Earth facing the Sun a half . . . 24 hours is the length of the average solar day (Synodic Day), the time it takes the earth to rotate so that (on average) it is facing the sun at the same angle Because the time period derives from a sun-referenced rotation, not a star-referenced rotation, the same spot on the earth faces the sun at approximately the same time every solar day
Why do we say that the Earth moves around the Sun? In the case of the two-body system things are quite simple The shape of Earth trajectory as seen from Sun or that of Sun as seen from Earth are the same In addition, since the center of mass of the Sun-Earth system is within Sun, Earth trajectory as seen from Sun is almost coinciding with the same orbit as described from the center of mass
What is the Metric of the Gravitational Field of the Sun? The spacetime around the Sun is very well approximated by the Schwarzschild metric, which is appropriate outside any constant, spinless, spherically symmetric mass distribution The Sun is almost perfectly spherical - the polar and equatorial diameters differ by only about 1 part in $10^5$ It also spins slow enough that one can usually ignore