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 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
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
What is actually meant by sun set and sun rise times, when taking . . . If this is the case, then when we read things like what time sun sets and rises on websites, books, calendars, other official times, et al… does that mean when we see for example ‘sun set at 18:35’ is the time denoting the actual sun set taking into account of the mirage or what is visible to us
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
Why does sunlight have low entropy? - Physics Stack Exchange 6 At the sun's surface, sunlight is similar to black body radiation at the sun's surface temperature Thus, if you brought a surface next to the sun's surface, it would be able to heat up to that same temperature And this temperature determines the entropy content of the sunlight Now the sunlight leaves the sun and spreads out through space
What is the simplest way to prove that Earth orbits the Sun? Assume you're talking to someone ignorant of the basic facts of astronomy How would you prove to them that Earth orbits the Sun? Similarly, how would you prove to them that the Moon orbits Earth?
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 reasonable precision
Why does the sun make me feel warm? - Physics Stack Exchange The sun outputs about 1300 watts per square meter (W m²) in space near the earth, which gets reduced to around 650 W m² in the middle of the day after going through the atmosphere 1 watt is defined as 1 joule per second (J s)