The probability that the recently-discovered Near-Earth asteroid 2024 YR4 would hit Earth in 2032 rose to 3.1%. In the following weeks, the probability dropped to zero. Why? Did astronomers make a mistake? No, but....join Dr. Gareth Williams (former Minor Planet Center Associate Director) as he describes the hows, whys, & whens of predicting Earth impacts.3rd Floor Community Room. All are welcome! Any questions, please email Adult Services Librarian Ryan Miller at rmiller@northadams-ma.gov or give us a call. 413-662-3133 ex16