Tim Bowling has been tweaking the calculator to better reflect how the energy of an impact/explosion energy behaves in an urban environment as opposed to wilderness or ocean.
Purdue offers this tool to authorities around the world so they can plan civil defense evacuation that could save millions of lives if a metor like this were to land directly on a major city.
Melosh's team emphasizes that the higher meteor risk is from the myriad of largely unidentified "city busters " glying around the cosmos.
Scientists have already identified over 90% of the massive "dino killer" asteroids.
Melosh and team have even developed nonnuclear plans to divert those big boys if one should take a dangerous trajectory towards earth, Bowling has also served on the Stardust-NExT science team that sent a NASA space craft close to the Tempel 1 comet to get detailed photographs of the comet and the crater Melosh's team helped create when it blasted the comet with another spacecraft to reveal the comets composition.
Three fires sent three different families out into the cold overnight.
The state of Indiana turns 197 on Wednesday.
The Indiana Motor Sports Commission approved the plans to move forward with a number of improvements at Indianapolis Motor Speedway.