Washington Post: NASA has taken the unusual step of disclaiming any endorsement of a paper written by one of its scientists, Richard Hoover of Marshall Space Flight Center in Huntsville, Alabama. The paper, which appears in the online Journal of Cosmology, claims that tiny, wormhole-like cavities in the Alais, Ivuna, and Orgueil meteorites constitute evidence of extraterrestrial bacteria. As Seth Borenstein of the Associated Press reports, other scientists are skeptical, given how easily the meteorites could have become contaminated. “There has been no one in the scientific community, certainly no one in the meteorite analysis community, that has supported these conclusions,” NASA Astrobiology Institute Director Carl Pilcher said of Hoover’s analysis.