changes made:
26 june 2011
remixed from http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1501.0
added real picture of planets
moved all control to bottom panel for ease of inquiry learning
must select a planet first before running the sim
made common checkbox to visual common variables for quick access.
made the reset remember previous planet remove removing numbers in the variable page.


known bug
render of simple 3d pictures which have transparent background should be transparent but is reckon with black ground which is not ideal and in earlier Ejs it is transparent.