BIOHAZARDS - Space Environment
Near Earth Objects - Meteors, Meteorites, Asteroids and Comets all have potential for great destruction. Events such as the Chelyabinsk meteor that exploded before impact shows the energy potential of these objects for destruction. Meteor Crater in Arizona shows the power of a meteorite. The majority of these objects have their origin within our solar system. The Earth's distance from our Sun is one Astronomical Unit (au). One AU is equal to 150 million km or 93 million miles.