can you tell me why earth has garvity and why earth rotates

Nez

For all questions on Homework,concerning Astronomy:

http://curious.astro.cornell.edu/que...php?number=465

Read down the page,and follow all instructions.

rajeevsrai

well this is a universal thing. two objects no matter how light attract each other. however if the mass is not huge we donot feel attraction. but in case of earth mass is enormous(24 zeros after one) so the force is so high that u can experience it.mathematically

lilfyre

Gravity is a force of attraction that exists between any two masses, any two bodies, or any two particles. It is the attraction that exists between all objects.you can try these two linksGravity Basics and Gravity From Wikipedia, the free encyclopedia they should be able to answer you questions completely. (O:

Starman

The earth rotates because the material from which it coalesced was rotating.
This is something shared by all other celestial bodies such as our sun.

thoth

The Newtonian or classical description of gravity is that is is a force that occurs between two objects. This description gives no reason why object have gravity.

In the early 1900s Einstein formulated a new and much better theory of gravity which explained the gravitational attraction between two bodies. In his theory object warp the very fabric of the universe (know as spacetime) much as a bowling ball would warp a trapaline.

So now space itself is curved and this in turn determines where objects move. It is the distortion of spacetime caused by the earth for instance which makes the moon orbit us and the distortion caused by the sun that causes our orbit.

A good way of remembering this is
'Space acts on matter telling it how to move, matter acts on space telling it how to curve'