In a meeting <a href=" http://siulodarba.com/writing-research-proposal-services ">essay on my pet pigeon</a> “The Perseids are the good ones,” says meteorite expert Bill Cooke of NASA’s Marshall Space Flight Center in Huntsville, Ala. Known for producing fireballs that might streak across a third of the sky, the Perseids owe their brilliance to the speed — nearly 134,000 mph — with which they smack into the upper atmosphere. “It’s also because of the size of the meteors,” Cooke says — dust grains about one-fifth of an inch across that burn nicely as they zip overhead.