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What Spaceguard did

A survey of large objects near Earth has shown that there is little risk of a cataclysmic impact in the next century. Alan Harris asks if such cataloguing efforts should continue.

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Figure 1: Estimate of the cumulative population of near-Earth objects (NEOs) versus size.
Figure 2


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See Editorial, page 1143 , and News Features, pages 1157 and 1165 .

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Harris, A. What Spaceguard did. Nature 453, 1178–1179 (2008).

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