why does the wold go around the sun?
357343
Wold, huh? Now how do you know for certain that it is not the sun that goes around the wold? Hah! \n\nHere is how to think about that, and it is the basis for orbital mechanics: Imagine holding a cannonball and dropping it to the ground. It will fall straight down. Now, if you add a bit of horizontal motion, the cannonball will fall a short distance away from you. Imagine now that you can throw the cannonball horizontally with a great deal of force.  It will still eventually fall to the ground, maybe 100 yards away, 200 yards, whatever, depending on how hard you threw it.  Now, if you accept the notion that the earth is a sphere, that means that the surface of the earth is ever so slightly curved and would drop away from your perceived horizontal plane at the horizon.  Now if you could throw the cannonball hard enough, as it sped away horizontally two things would happen: (1) the cannonball would begin dropping to the earth, and (2) the earth would be curving down under the cannonball and away from it.  Now if you could throw this cannonball so hard that it would get away over the horizon, so far in fact that the earth would curve away as fast as the cannonball dropped towards it, then you would be in orbit, and end up circling all the way around back to where it started, and if had been going fast enough it would keep on orbiting. Increase the speed even more so it goes farther horizontally than the earth curves away vertically underneath it and you have reached escape velocity, which would send the cannonball off into space. \n\nSo if you subsitute the sun for the earth and the earth for the cannonball you can see why the earth orbits around the sun, it's the same idea.  If the earth were travelling along its orbit at a slower speed than it is it would fall into the sun; at a higher speed and it would fly off into space.
1058600
both are always in the sky. sun goes round the earth and the earth goes round the moon. depends on the time of year moon cycles etc etc
146069
The tendency of light to travel around corners is called diffraction.It is due to the mass character of light.So light bends around the edges.This can be seen from the fact that when light passes near a planet , it bends towards the planet.This can be tested during solar eclipse.
711289
Actually, those circles are NOT perfect.  They're slighly elliptical.  This is called the excentricity of the orbit.  \n\nBut, yeah, they are more or less on circles, and that's because they want to go straight forward (inertia) but the pull of the Sun's gravity stops them from goind away.\n\nIt like tieing a ball on a rope and turning it around.  It makes a circle.  Let go of the rope, and it will go on a straigt line.  The rope is the Sun's gravity.
32921
Um... what are you asking here?  I think an answer would be that the planets revolve around the sun because the sun it so massive that it makes a small 'dent' in space-time, and the planets 'fall' towards the depression.  There are 9 planets in the solar system, and Earth is the third from the sun and the largest of the inner rocky - planets.  Many of the planets have satellites, called moons.  Earth's moon is called Luna which is (relative to the size of its planet) particularly large.  The planets also rotate on their axises (which is why we have, among other things, night and day).  Nearly all planets also have an atmosphere, a layer of gas that exists above the planet's surface, though only Earth has an atmosphere suitable for breathing.   Beyond Pluto, the last official planet, is a very large void followed by a large collection of planetary fragements (meteors), then another large void.  The solar system ends at a boundry called the heliopause, the outtermost reaches of the sun's solar winds (think of it as a wind made of radiation).  If you travel through the heliopause, you would experience an arguably extreme 'termination shock' as you enter an even larger void into intersteller space.  Okay, that's all I got.
337385
the sun directly casts it rays on the equator. the earth is tilted at a slight angle, so, that means that one of the poles are sometimes farther away than the other, but the equator always faces the sun and gets the full force
1184119
Jupiter is further from the sun, and has a larger orbital path.  That is why it takes longer (it has to travel further to go around)
464601
Earth revolves around the sun because the giant nebula out of which the solar system formed was spinning and the angular momentum is conserved, and earth spins because of the initial config. Why it revolves in an ellipse, see this\nexplanation at http://www.mathsnet.net/cabri/feynman.html
1103836
The sun isn't moving.\nThe sun appears to move east to west because Earth is rotating on its axis (actually, the earth is rotating on its axis, as well as rotating around the sun)
711345
Earth orbits in a counterclock wise direction around the sun.\nIt takes approximately 365.25 days do orbit around the sun.\nThe gravitational forces between the sun and earth and the resulting centripetal and centrufugal forces makes the earth go around.
676514
The sun DOES rotate! It also revolves.
374997
The sun is the larger object. So, it has more gravity. The earth moves around the sun and centrigfugal force keeps it going around rather than crashing into it. It continues to move because there is no gravity or atmosphere in space to slow it down. Once a spaceship or rocket leaves the earth's atmosphere and pull, it keeps going even without its rockets on. It just keeps going in the direction it was pointed. \n\nTo learn more, see http://spaceplace.nasa.gov/en/kids/phonedrmarc/2002_july.shtml
1027284
because the sun's gravitational pull is much greater than the earth's...same reason the moon goes around the earth and not the other way around
659160
It absorbs light energy from the sun.
35969
The Earth rotates (spins around).  Sometimes a side is facing the Sun and is in daytime.  Sometimes it is not and is in nighttime.
370975
no one can prove the sun revolves around the earth because the sun doesn't orbit the earth.  the following link may help. http://spaceplace.nasa.gov/en/kids/barycntr.shtml
202841
The equinox is defined as the point where the sun is directly overhead on noon at the equator.  This is very close to when the days and nights are equal, and if the earth traveled around the sun in a perfect circle, they would be the same.\n\nBut the earth travels around the sun in an elliptical path.  Sometimes it is closer to the sun, travelling more quickly, and other times it is further away, travelling more slowly.  This introduces small discrepancies in the length of the day.