Astronomers say viewing conditions are promising for the Perseid meteor shower this year. A new moon will prevent moonlight from spoiling the show. NASA says about 50 to 100 meteors per hour may be visible under ideal conditions during Wednesday night’s peak. The Perseids will coincide with a total solar eclipse across Spain, Iceland and Greenland and a six-planet parade. The best time to view the fireballs will come after totality. Meteor showers happen when Earth plows through trails of debris left by comets or asteroids. The Perseids come from comet Swift-Tuttle. The next major meteor shower peaks in October.