Tonight, grab a 7:30 p.m. low cost ($4) lecture on planets, stars and brown dwarfs with Dr. Ray Jayawardhana at the JCC. We love the JCC space, because it's organized, clean, and spacious. There's a friendly vibe, too, but be prepared to pop your trunk for a bomb search if you park in the JCC lot. Origins of Planets and Brown Dwarfs at the Jewish Community Center of San Francisco, 3200 California Street. Phone:......