re:For ET I didn't know complete understanding and immediate recall of white rock "knowledge" was a litmus test for planetary science knowledge.
ET,
It shows that you are willing to criticize something you have no idea about. Typical of a hypocrite and self appointed Mars know-it-all. It is quite obvious you are an amateur astronomer at the very basic level. Please restrict your communications with your Mars Society buddies. I'm sure if you are a good boy you might get to wear one of those canvas and duct tape space suits with your name sewn on. Your name tag could read "ET The Extraterrestrial".
Read a good comic book ET, planetary science isn't your cup of tea.
BD