The
easiest way to think about this problem is by looking at it
from the asteroid's perspective. Here is Earth racing at me
doing 50 km/s. What velocity do I need to get out of the way?
First, I need to know how large Earth is and then it is simply
a matter of going that distance within three months. Naturally,
I want to give myself that velocity in a perpendicular direction
to Earth.
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