... we believe are characteristic of large asteroids, and even comets that could slam into the earth" (Sharpton, http://www.bbc.co.uk/science/horizon/spacecratertran.shtml). This is the important fact that led the elder Alvarez and his colleagues to come to the conclusions that were to be published in the journal, "Science" in 1980. Before finally deciding that they believed it was indeed ... to have been, " a mere one-tenth of a light year away. There was only a one-in-a-billion probability of that having happened in the last 500 million years" (Wilford, 267). Due to this and other scientif...

• Word Count: 2956
• Approx Pages: 12
• Has Bibliography