Exoplanet comet impacts
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This artilcle in Space Review speculates on the chance of detecting a large comet or asteroid impacting a rocky exoplanet. Averaged over millions of year, it is predicted that an impact occurs every fews weeks within a radius of 1000 light years of our solar system.
This rate seems high but is biasd by the much higher impact rate in young solar systems.
The chances of detecting the impact with curent technology are slim but it is worth consdering when analysing data gathered for other purposes.
A successful detection would indicate that other solar systems are similar to ours and the impact flash might tell us something about then chemistry of the planet. It might also signal a mass extinction event.
Michael Paine, author
see other credits in the article
Researchers should cite this work as follows:
Michael Paine; Michael Paine (2013), "Exoplanet comet impacts," http://astrobiologyfuture.org/resources/18.