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Re: Dinosaurs in space?

Ken, taking the average velocity of earth ejecta from multiple impacts as a
whole, the average velocity with respect to the sun would converge on the
orbital velocity of the earth itself, so on the whole there would be no
gravitational trend driving the ejecta sunward.  Taking average ejecta velocity
of  a single event, the velocity with respect to the sun will depend on whether
the material is kicked out in the direction of the earth's orbital velocity,
adverse to it, or in some other direction.  To reach the sun itself, the ejecta
would need to be kicked out retrograde at a velocity of at least 18.5
miles/second, but not much more than that.


Ken Kinman wrote:

> Gravity tends to pull most
> debris toward the center of the solar system, so finding Mars rocks on Earth
> is more likely than finding Earth rocks on Mars (the escape velocity factor
> you mentioned would enhance this tendency further).