Nov. 6, 7 PM - The Meteor That Exploded Over Russia Last Year: Can We Survive a Bigger Impact? by David Morrison
On Wednesday, November 6th, 2013, at 7 pm, Dr. David Morrison (of the SETI Institute and NASA’s Ames Research Center) will give a free, illustrated, non-technical talk on:
The Chelyabinsk Meteor: Can We Survive a Bigger Impact?
in the Smithwick Theater at Foothill College, in Los Altos.
The talk is part of the Silicon Valley Astronomy Lecture Series, now in its 14th year.
What would happen if an asteroid collided with the Earth? On February 15 2013, a rocky projectile entered the Earth’s atmosphere traveling at more than 11 miles per second. It was about 65 feet in diameter, or half the diameter of the impact of 1908, which flattened a thousand square miles of Siberian forest. Its terminal explosion, at an altitude of 14 mi, released energy of about half a megaton, equivalent to a couple dozen Hiroshima-sized atom bombs. About two minutes later, the shock wave reached the ground in Chelyabinsk, Russia, breaking windows and injuring about 1500 people from flying glass. Since the impactor approached the Earth from very near the direction of the Sun, it could not have been seen by any ground-based optical telescope of any size. It therefore struck without warning. Has this event served as a kind of cosmic wake-up call for planetary defense? NASA recently announced a 'grand challenge" to find all asteroids that could threaten human populations, and to figure out how to deal with them. David Morrison will discuss the Chelyabinsk impact and evaluate ways we might meet the grand challenge to protect our population from space impacts.
Dr. David Morrison, an astrobiologist and planetary scientist, is the Director of the Carl Sagan Center for Study of Life in the Universe at the SETI Institute in Mountain View. He has been an international leader for two decades in defining the asteroid impact hazard and planning approaches to planetary defense; in recognition of this work, asteroid 2410 Morrison is named in his honor. Morrison has also made many contributions to teaching astronomy and space science, including authorship of several college textbooks in astronomy and planetary science. He is a popular writer and public lecturer, promoting a scientific and fact-based perspective about such topics as the evolution-creationist conflict and climate-change denialism. Recently he was awarded NASA Exceptional Achievement medal for using science to counteract public fears about the end of the world in December 2012.
For a campus map, see: http://www.foothill.edu/news/maps.php
The lecture is co-sponsored by:
* NASA Ames Research Center
* The Foothill College Astronomy Program
* The SETI Institute
* The Astronomical Society of the Pacific.
We expect large crowds, so please arrive a little bit early to find parking. Having exact change or bills for the $3 parking fee helps speed up the line.
GOOD NEWS: Past Silicon Valley Astronomy Lectures are now available free on YouTube, at the series' own channel at:http://www.youtube.com/user/SVAstronomyLectures/.
The site gives instant access to over two dozen past lectures, including Steve Beckwith on the Hubble Telescope’s deepest views, Mike Brown on his discovery of world beyond Pluto, Natalie Batalha on the Kepler mission planet discoveries, Chris McKay on what it’s like on Saturn’s moon Titan, Sandra Faber on the origin of galaxies, Alex Filippenko and Roger Blandford on black holes, and Seth Shostak on new approaches to finding extra-terrestrial civilizations.