Not in at the moment <a href=" http://www.proartsgallery.org/buy-bupropion-hcl-xl-300-mg.pdf ">buy bupropion sr online</a> "Comet Swift-Tuttle has a huge nucleus &mdash; about 26 kilometers [16 miles] in diameter," Cooke said in a statement. "Most other comets are much smaller, with nuclei only a few kilometers across. As a result, Comet Swift-Tuttle produces a large number of meteoroids, many of which are large enough to produce fireballs."