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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 is the simplest way to prove that Earth orbits the Sun? If we assume the Sun orbits the Earth, the math says that the Sun should be much less massive than the Earth If we assume the Earth orbits the Sun, the opposite is true Either way we can get an estimate of the mass of the Sun We know from other tests that the Sun is more massive than the Earth, so therefore the Earth orbits 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
Why doesnt sun go all the way to the horizon during sunset? However, there may be an illusion where sun's position at horizon may appear slightly different than it actually is due to atmospheric refraction It may be useful to read this Also, in the second image, there appars to be layer of clouds under the sun, maybe the sun is disappearing behind those while still remaining above horizon, i e not
How can sunlight be white , but pictures of the sun be orange? The Sun is white, but the reason why it is white is because your brain adjusts the white balance to make the totality of all the ambient light illuminating the objects you see, white Now, the Sun is too bright to look directly at safely, but around dusk or dawn you can sometimes see by accident a glimpse of it, and it then looks red
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 if the Sun became a black hole? - Physics Stack Exchange Inside the sun’s radius, however, is a different story As it currently stands, the curvature of spacetime increases as one approaches the sun’s radius and then, after passing the boundary, decreases until levelling out in the center of mass of the sun