factors that can change the Earth's rotation or revolution.

factors that can change the earths rotation or revolution, may be a change in gravity (which will most likely never happen) or earth quakes.


6 years ago, scientists found that seasons were occurring on Neptune. They found out because the Hubble Space telescope was orbiting Neptune. Hubble found a ring of clouds on Neptune's surface and discovered that seasons were occurring on Neptune!!!


http://scienceblogs.com/startswithabang/2012/02/eta_carinaes_21-year_outburst.php

The Big Bang Theory

The Big Bang was the start of the Universe really. The Big Bang happened according to scientists, 13.7 billion years ago. After The Big Bang it cooled and created sub-atomic particles. Although it took some thousands of years to make a universe, it first produced hydrogen, helium, and lithium. They would then have produced dust clouds and formed gravity! Even though this is a (successful) scientific theory. It is the only explanation we know on how the universe happened. Through more and more time, we will find out more on how the universe started.