The weather looks promising, and the moon won't spoil this weekend's Leonid meteor shower, one of the best of the year. Astronomers expect the peak between 11:45 p.m. Saturday and 1:30 a.m. Sunday. Observers far from city lights could see 100 meteors per hour. But it will take days, beginning tonight, for Earth to traverse the dust ejected from Comet 55P/Tempel-Tuttle when it passed this way in 1932. Best to look before dawn, when Leo is high. The display might be faint, but there's always room for surprise.