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- astronomy - How big a coincidence is the Sun and Moon having almost . . .
It's consensus that the very similar apparent sizes of the Moon and the Sun as seen from Earth is a coincidence (as already answered in this site) This provides us with almost exact total solar
- 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 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 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
- 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
- What does the Moons orbit around the Sun look like?
Here are some things I'm assuming when trying to tackle this question: The Moon's orbit must be concave toward the Sun The Moon speeds up as it goes toward the Sun, and it slows down as it moves away For an observer on the Earth, the Moon appears to orbit the Earth roughly $13$ times a year The Earth, the Moon, and the Sun remain in the same
- newtonian mechanics - How come the Suns gravity can hold distant . . .
The Sun is keeping you close After all, you are orbiting it just like the Earth You don't fly off into space because the Earth and you experience the same acceleration due to the Sun's gravitational force, so you orbit together; this is sometimes called the equivalence principle If, however, you were floating near Earth but closer to the Sun, you would experience stronger gravity You would
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