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Junkmaster
Near Earth object comes close to hitting earth!

Check out-
http://neo.jpl.nasa.gov/news/news142.html

also see- for what happens if-


Catastrophe Calculator: Estimate Asteroid Impact Effects Online

The history of Earth's encounters with asteroids remains largely mysterious to scientists. They can't even agree whether a huge space rock that hit Mexico's Yucatan Penninsula 65 million years ago killed off the dinosaurs or not.

Nor can astronomers say when the next catastrophic impact will occur. They only know that it will happen, sooner or later.

However, now anyone with a passing interest in the fate of the planet can remove some of the mystery regarding the effects of the next collision. A new University of Arizona web page allows visitors to plug in a hypothetical space rock's size, the visitor's distance from the impact site, and other parameters to generate an outline of devastation.

But be warned: Removing the mystery invites a bit of terror over the hypothetical slams, bangs, fireballs, falling skies and rushing winds generated by a giant impact.

Prepare to be scared

Being somewhat of a voyeur when it comes to natural catastrophe, I couldn't resist running some scenarios through the new catastrophe calculator.



http://space.com/scienceastronomy/mystery_monday_040412.html

and

http://www.lpl.arizona.edu/impacteffects/
 
Interesting. What surprised me is that you would actually hear it impact after awhile, even at 1000 miles away:

The air blast will arrive at approximately 5366.7 seconds.
Peak Overpressure: 74.3 Pa = 0.0007 bars = 0.0106 psi
Max wind velocity: 0.2 m/s = 0.4 mph
Sound Intensity: 37 dB (Easily Heard)
 
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