why earth is rotating in an axis exactly ,since the universe is expanding it could have moved zigzaly y???

Answer 1

In spite of the fact that the universe is expanding, locally space is virtually static with respect to nearby objects--the expansion only becomes significant when considered on an enormous scale.

Answer 2

Angular momentum is conserved, so the orientation of the earth's axis of rotation changes only in response to an outside force. There is such a force -- the gravitational attraction of Jupiter, which causes a nutation of the axis. The effect is called precession of the equinox, and it causes the axis to describe a circle once every 25,000 years. Hence, the present pole star will, in the distant future, not be the pole star. Surprisingly, the effect has been known since ancient times.

Answer 3

The expansion of the universe would have little effect locally, for a variety of reasons. And the rotation of the earth upon its axis is in fact wobbly.

Answer 4

Hi. Actually it is not. The Earth wobbles on its rotational axis.

Answer 5

If you spin a top and walk away, would it start wobbling because you walked away? No, only gravity affected to top. If the top had no friction and gravity to change the spin, you're walking away would have no affect whatsoever.
Earth is just a puny, insignificant, teeny-weeny, piece of dust in the Grandness of the Universe. I seriously doubt the Universes, "walking away" affects us at all.

Answer 6

The expansion of the universe has little or no effect on the bodies of our planetary system and the ais wobbles anyway so it's not absolute

Answer 7

It's probably expanding in a proportion of solar systems compared to galaxies, not in planets specifically.