Travel to interstellar planets ...

[technomage]

Sweeet! Brings a whole new meaning to "And yet it moves!"

[oxmixmudd]

Ok fellow cosmo - nuts.

Heres an answer I found on radiation from a physics paper I googled at 'instellar ship shielding'. Wow that was tough.

"Shielding seems to be easy for ship’s velocities below 0.3c; a titanium or aluminum hull of 1 to 2 cm in thickness can provide sufficient protection against the oncoming flow of nucleonic radiation. However, when the ship’s speed is close to the relativistic barrier c, say 0.8 – 0.9c, a windward shield of several meters of titanium or,
more practically, tens meters of water will be needed.."

So, looks like the proposed "Hollowed out asteroid with 60 ft thick steel walls is WAAY over designed..but would work at .1-.9c speeds ! Since we have calculated that our Orion engine can power us to Alpha C in 44 yrs..its a go ! *with current technology of course. This is a 3 generation ship if we make a round trip and get back home by looping around the star.

According to the paper, shielding is an engineering problem that is solvable. Lots easier at low speeds.

Compares rad dose to an unshielded nuclear reactor at higher speeds. But, we shield those routinely for 60 years with 5 ft steel and maybe 10- 20 ft of concrete. So we have proof of concept pretty easy there.

=========================

See RADIATION HAZARD OF RELATIVISTIC INTERSTELLAR FLIGHT

exactly - and a good find. Thanks Galileo. But Jorge has a long list of objections and with each one answered or discussed will simply move on to the next. And then of course there is his mystery problem that is somehow related to the density of the ISM. I know what it is not, it is not friction slowing the spacecraft, and it is not radiation as you show above. Likewise it is not too much heat being generated on the windward side. And it's not a rare but devastating impact with some random piece of significant mass 'cause that has been already discussed separately.

I do wonder what it is. But I can tell you this, he keeps it a secret because that way he gets to feel superior. But if he ever actually divulges the specific issue he is concerned with, I would be very surprised if it is something not already considered by those exploring solutions to interstellar travel.


Jim

[Jorge]

I do wonder what it is. But I can tell you this, he keeps it a secret because that way he gets to feel superior.
Jim

****************************************************

[sigh ...]
As soon as I read the above, the word "projection" popped into my mind.
You need help, Jim ... GET IT NOW !!! Dial 1 - 800 - GET - HELP

Jorge

[Cerebrum123]

I reiterate. Killjoy.


And, for what it's worth, he isn't Martian

Yeah, but all we need to do is take him to Mars, he doesn't have to be native.

[rogue06]

Yeah, but all we need to do is take him to Mars, he doesn't have to be native.

If a Scotsman visits English does that somehow make him English? If so then all we have to do is call Melvin a gremlin and he is one. Less expensive than a trip to Mars as well.

[Cerebrum123]

If a Scotsman visits English does that somehow make him English? If so then all we have to do is call Melvin a gremlin and he is one. Less expensive than a trip to Mars as well.

It is MARVIN the Martian, not Melvin. You sir are not fit to use his image.

[Sparko]

If a Scotsman visits English does that somehow make him English? If so then all we have to do is call Melvin a gremlin and he is one. Less expensive than a trip to Mars as well.

How do you visit a language?

[rogue06]

Melvin/Marvin English/England. Hey, I was distracted. The bacon was ready.

[Cerebrum123]

Melvin/Marvin English/England. Hey, I was distracted. The bacon was ready.

I don't care, what you said was downright BLASPHEMOUS.

[rogue06]

.

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.

[rogue06]

I don't care, what you said was downright BLASPHEMOUS.

They all look alike to me: MELVIN the Martian

[Cerebrum123]

They all look alike to me: MELVIN the Martian

The helmet is VERY distinctly different. You can't even keep up with cartoons, why on earth should I trust you on science?

[rogue06]

The helmet is VERY distinctly different.

Same thing only different. Killjoy.