[ExI] Life must be everywhere!

Tomasz Rola rtomek at ceti.pl
Sat Apr 14 16:49:20 UTC 2012

On Sat, 14 Apr 2012, Tomasz Rola wrote:

> I was thinking of the other end of this "pan-sperm adventures", i.e. 
> landing on a remote body. Escape velocity for Solar System is 525 km/s. 
> This is how fast - at a minimum - an ejecta will have to go to make it 
> anywhere.
> One can play with impact effect calculator, here:
> http://impact.ese.ic.ac.uk/ImpactEffects/
> to see how hard (or maybe easy) actually it is going to be for any life to 
> survive an impact with Earth-like planet. I assume if I could got burned 
> alive standing at 100 km distance from impact of 1km-radius iron body 
> running at 525 kmps, the effect is like quite a big nuclear weapon blast. 
> How much life survived at test epicenters? Without looking for data, I 
> guesstimate everything close to impact will get sterilized.

It is no better with smaller objects, which evaporate during atmospheric 
entry. Again, I assume temperature alone is enough to get rid of a life 
problem. Deceleration is going to improve this, I think.

Add to this millions of years it takes to get somewhere inside 20ly 
radius. All those years ejecta is subject to all kind of radiation - full 
spectra, actually, including possibility of supernova during such a long 

Tomasz Rola

** A C programmer asked whether computer had Buddha's nature.      **
** As the answer, master did "rm -rif" on the programmer's home    **
** directory. And then the C programmer became enlightened...      **
**                                                                 **
** Tomasz Rola          mailto:tomasz_rola at bigfoot.com             **

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