Chunks of a comet currently splitting into pieces in the night sky will not strike the Earth next month, nor will it spawn killer tsunamis and mass extinctions, NASA officials said Thursday. The announcement, NASA hopes, will squash rumors that a fragment of the crumbling Comet 73P/Schwassmann-Wachmann 3 (SW 3) will slam into Earth just before Memorial Day. "There are some Internet stories going around that there's going to be an impact on May 25," NASA spokesperson Grey Hautaluoma, told SPACE.com. "We just want to get the facts out." Astronomers have been observing 73P/Schwassmann-Wachmann 3, a comet that circles the...