Scientists classify comets and asteroids that pass within 28
million miles of Earth's orbit as near-Earth objects (NEOs).
Asteroids that collide and break into smaller fragments are the
source of most NEOs, and the resulting fragments bombard the Earth
at the rate of over 100 tons a day. Although the vast majority of
NEOs that enter Earth's atmosphere disintegrate before reaching the
surface, those larger than 100 meters (328 feet) may survive the
descent and cause destruction in and around their impact sites.
Furthermore, even smaller objects that disintegrate before reaching
Earth's surface can cause significant damage. This book examines
NASA's NEO Program and assesses the Agency's progress toward
meeting statutory and other Program goals. Specifically, it reviews
NASA's allocation and use of resources and plans for the future of
the Program.
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