  Large or even medium sized asteroids impacting the Earth can cause damage on
a global scale. Existing and planned concepts for finding near-Earth objects
(NEOs) with diameter of 140 m or larger would take ~15-20 years of observation
to find ~90% of them. This includes both ground and space based projects. For
smaller NEOs (~50-70 m in diameter), the time scale is many decades. The reason
it takes so long to detect these objects is because most of the NEOs have
highly elliptical orbits that bring them into the inner solar system once per
orbit. If these objects cross the Earth's orbit when the Earth is on the other
side of the Sun, they will not be detected by facilities on or around the
Earth. A constellation of MicroSats in orbit around the Sun can dramatically
reduce the time needed to find 90% of NEOs ~100-140 m in diameter.
