Asteroids, Meteorites and Dangers to Life on Earth
by Dr. Laurence Garvie, Research Professor and Curator,
Center for Meteorite Studies, ASU
Dr. Garvie investigates extremem einvironments from the reaches of outer space to the Sonoran Desert at the School of Earth and Space Exploration at ASU. He explores teh relationship between asteroids, impacts and whate we can do to save our species. The Chelyabinsk meteor of 2013 entered Earth's atmoshpere at 69,000 km/h (42,875 mph) explodig around 30km (8.6 mi) above the ground and releasing the equivalent of 600 kolotons of TNT of energy.
Fortunately, our atmosphere disrupted and vaporized the majority of the 20 meter (22 yard) asteroid, with most materila falling to Earth as pea-sized stones. However, a recent analysis of terrestrial asteroid impacts has highlighted the surprisngly high frequency of those with enough energy to destroy a city.