In your message dated Tuesday 17, February 1998 you wrote : > Could all these > fireballs be the precursors to the big rock? Is an extinction period > beating at our door in the form of mounting numbers of bolides? The short answer would seem to be no. In fact, fireball activity has declined slightly over the past 40 years. -- Phil Bagnall http://www.ticetboo.demon.co.uk/