Dear Steve (and vsnetters), >Thanks for the answer on the supernova question; would you happen to >know the answer to these other questions: > >--Planetary nebulae eject what two heavy elements into the galaxy? It depends on their track of evolution. >--What satellite galaxy is moving fastest toward the galactic center? The satellite galaxy of our Galaxy? Sorry I don't know. >--How many miles per second does the Sun move in its orbit? If you mean the galactic rotation, it is about 200-250 km/s = 125 - 155 miles/s. Sincerely Yours, Hitoshi Yamaoka, Kyushu Univ., Japan yamaoka@rc.kyushu-u.ac.jp