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

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

Historically, how do we know that Earth moves around Sun? And

Questions: -- Sun is something we see on daily basis, so it would not be strange if humankind got curious to know about it, and made theories,observations,maths to prove it. How did

How is Earth protected from the gamma rays generated by the Sun?

The Sun is generating energy by nuclear fusion. This nuclear fusion will emit energy in the form of gamma rays. Normally, the earth''s ozone layer filters the ultraviolet radiation while the earth''s

What would happen if Jupiter collided with the Sun?

This question is inspired by a similar one asked on Quora. Let''s say a wizard magicked Jupiter into the Sun, with or without high velocity. What happens? The Quora

How much lux does the Sun emit?

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 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

astronomy

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

What is actually meant by ''sun set'' and ''sun rise'' times, when

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

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