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Asteroids 101:   The next page  provides information on asteroids.   What they are, why monitor them, where they are, the main types, how we calculate rotation and orbits, how large an impact is needed to torch a continent, their locations, should we lasso one and sling it into an orbit around the moon, and more...

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                      Early warning system comparisons

Early warning system comparisons  In the tables below we compare the following three types of systems:  (1) ground-based radar, (2) space-based optical, and (3) ground-based optical.  What are their capabilities and limitations?  Could they have warned us of the Russian asteroid?