Subject: Re: Richard Feynman explains why Mars a one way trip

First point, wrt the impossibility of operating machines on Mars. The Perseverance rover has been operating for over 5 years. Curiosity has been operating for 13 years, far beyond it's intended life.

I thought this too. There's a wind in the light atmosphere on Mars. The sands in Saudi aren't good for making concrete as they're too round and smooth. River and beach sand, etc., are good for concrete because they aren't too round. They've been doing experiments with explosives and Saudi sand for concrete, I presume they're trying to fracture it.

Since our Mars machines are encased in metal, they should be covered with dust - they aren't, so the magnetic part of the dust he talks about hasn't appeared

It's late.