How long until the sun gets burned down to the point where it cannot sustain life on earth anymore 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 The sun's energy comes primarily from fusion of light elements in its core 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 has the distance between sun and earth been calculated
Also what is the size of 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? What is the isotope composition of hydrogen atoms in the sun Are the ratios of protium:deuterium:tritium similar to those we find on earth
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. 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).
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