Sun is a renewable source of energy

How come the Sun''s gravity can hold distant planets in orbit, but

First, we should speak of acceleration rather than force, because like I said earlier all objects at a given distance from the Sun experience different forces but the same acceleration. You

Nuclear fission in the Sun

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...

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 almost exact total solar

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.

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

Why does the Sun always rise in the East?

The Sun does not rise, it is the horizon that goes down. You say that Sun rises in the East (with a certain degree of oscillations due to the tilt of the axis) just because the Earth spins from

Why does the Sun "shine brighter" some days?

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

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...

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

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