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likelihood of destruction due to meteors, comets or
asteroids hitting the earth.
"What are the odds that an asteroid impact will destroy
your being in a given year? Slim -- 1 in 74,817,414,
according to data compiled byThe
"Asteroids with a 1 km (0.62 mi) diameter strike
Earth every 500,000 years on average.Large
collisions – with 5 km (3 mi) objects – happen
approximately once every twenty million years. The last
known impact of an object of 10 km (6 mi) or more in
diameter was at theCretaceous–Paleogene
million years ago." Read More Wikiedia
NASA Planetary Defense
Observations Program is
responsible for finding, tracking, and characterizing
near-Earth objects- asteroids and comets whose orbits
periodically bring them within approximately 1.3
Astronomical Units (AU) of the Sun.