[aerohead]

Originally Posted by RedDevil

The only practical way to make a permanent settlement on Mars or the Moon is by going under the surface. Only a deep tunnel provides adequate protection against solar and cosmic rays when there is no atmosphere and no magnetosphere.

We migrate from our planet to become cavemen again.

The Stanford (University) Underground Research Facility is operating neutrino experiments deep underground at the old Homestake Gold Mine in South Dakota.The hard rock there is especially good at blocking cosmic rays.