astronomy - How big a coincidence is the Sun and Moon having …
May 3, 2020 · 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
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 is the Sun approximated as a black body at ~ 5800 K?
Mar 20, 2019 · Approximating the sun as a black body effectively means that it's surface temperature is 5800K. And, indeed, if we look at the most dominant wavelength of the sun spectrum, the maximal …
Why do we say that the Earth moves around the Sun?
3 The sun, moon, earth (and so on) all move around each other. The reason we say the earth moves around the sun is because the effects are more visible on a macro scale, and easier to predict with …
How is distance between sun and earth calculated?
Feb 15, 2011 · 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 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
Sun light takes 1,000/30,000/100,000/170,000/1,000,000 years …
Nov 22, 2022 · When light (photon particle) is generated inside the Sun, it takes a long time to bounce around inside to later escape and travel outwards. Neutrinos escape immediately. The numbers for …
How can sunlight be white , but pictures of the sun be orange?
Our sun is white (or rather, it gives off a variety of wavelengths of light that, when combined, appear to be white.) During sunrise or sunset it appears yellow/orange because the air, dust, and pollution …
Why are there dark lines in an absorption line spectrum from the Sun ...
Sep 7, 2018 · As the radiation passes through a gas, certain wavelengths are absorbed. Those same wavelengths appear in emission when the gas is observed at an angle with respect to the radiation …
everyday life - Why do sunbeams diverge even though the sun is much ...
Dec 26, 2014 · The Sun is very far away and the beams are pretty much parallel, but they're pointing towards you, and perspective makes them appear to converge towards the vanishing point - which in …