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