Starship Asterisk*

I've read that a gamma ray burst (GRB) that happened to hit the Earth could possibly destroy half our ozone layer. How close would such a burst have to be to cause this kind of damage damage?

Hi Mate.

http://en.wikipedia.org/wiki/Magnetar

I here one happened in 2004 that disrupted earths magnetic field, from 50,000 light years away.

Other folks here may have more details.

M.S

Thanks, Mark!