[ExI] Fermi Paradox and GRB bursts

BillK pharos at gmail.com
Fri Oct 3 18:37:32 UTC 2014

On Fri, Oct 3, 2014 at 7:17 PM, Keith Henson  wrote:
> It would be close to 670 km/s spinning at 60 RPM.  Low earth orbit is
> ~8 km/s so this is around 84 times faster.  I.e., physics tells you
> that an earth sized planet can't spin anywhere close to fast enough to
> get toasted all around by a GRB.

GRBs vary in duration and strength. The paper tries to take account of
all the types of GRBs.

The problem is not just radiation exposure to part of a planet. You
have to account for secondary effects as well. Serious damage to the
ozone layer and atmosphere damage similar to a nuclear winter would
affect the whole planet.

Evolution could be postponed for millions of years.


More information about the extropy-chat mailing list