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Comment: Re:Neil deGrasse Tyson (Score 1) 520 520

A few comments on your comments. Firstly, the compressive strength of NEOs is not well understood. Many may be little more than self-gravitating rubble-piles, in which case your reaction engine will simply dig itself into a pit whilst ejecting boulders around it. Net result, multiple impactors on the same heading as the original body - which is Not Good. The mathematics is simple to perform for a gravity deflector. Here the displacing force is dispersed over the whole body - no single point stresses to accommodate. What is not so simple to gauge is the mass of the inbound body. And knowing that quite well is crucial to the success of a gravity tractor. You are at least correct in estimating the need for multi-year duration burns to deflect plausible objects. That is neither impossible nor impractical.

"If you own a machine, you are in turn owned by it, and spend your time serving it..." -- Marion Zimmer Bradley, _The Forbidden Tower_

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