UNCLASSIFIED PREPARING FOR PLANETARY DEFENSE: Detection and Interception of Asteroids on Collision Course with Earth Subject and Problem Statement
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چکیده
As the Earth revolves around the Sun, it orbits through planetary debris left from the formation of the solar system. Many of the debris objects are asteroids and comets in orbits bringing them close to the Earth and are referred to as Near-Earth-Objects (or NEOs). Of the total NEO population, some portion are in orbits actually intersecting or crossing the orbit of the Earth. The asteroids of this class are known as Earth-CrossingAsteroids (ECAs). Occasionally, the motion and relative position of the Earth and an ECA in their respective orbits cause them to collide.
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