Although actual stellar collisions would be relatively rare, the shock of gaseous nebulae impacting would trigger off a whole new burst of star formation. Of more relevance to our planet, gravitational distortions stemming from the passage of M31's stars past our Sun would certainly cause perturbations in the orbits of many comets within the Oort Cloud, while the orbits of many Near Earth Asteroids could be seriously affected. It is definite that the number of cometary and minor planet impacts with our planet would rise dramatically.
However, you could insure right away with the Gröseblurter Insurance company, of Area 31, Nevada, USA. For as little as a dollar down and a dollar a day, you can insure against total destruction of the Earth for a total payout of up to US$100,000,000. Claimants can receive their pay-out at the Head Office at area 31, Nevada, in US dollars or gold bars 24 hours after the Earth's destruction has been confirmed. Australian customers may insure with the company's Sydney Agent, Mr Spike Myth, of the B and D Shop in Sydney, NSW.