[ExI] Ultra-cryonics

[Eugen Leitl]

On Mon, Mar 18, 2013 at 09:51:01PM -0400, David Lubkin wrote:
> Terrestrial cryopreservation is roughly at 77°K. As we move outward in

-196 C is too cold. Intermediate temperature storage 
at -120..-130 C is optimal, with current glass-formers.
I expect that temperature to go up in future.

> space, the ambient temperature drops. Ignoring rotation, a suspended
> human in the asteroid belt will be roughly 165-200°K without a dewar.
> The Kuiper belt, however, is about 50°K, and the Oort cloud is believed
> to be 4-10°K.

Cryonics is currently expensive and unsafe enough.
No need to add rockets to that mix.

> Would any measures be required to safely cool a patient to 50°K or to
> as low as 4°K beyond what we do today to cool him down to LN
> temperatures?

Why would you want to?

> Would our current suspension procedures have to be (or ought they be)
> modified for new patients, knowing they would be stored at a lower
> or much lower temperature than LN?
>
> What protection would ultra-cooled, deep space suspendees require?
>
> Comes to mind:
>
> - shielding against cosmic rays
> - shielding against dust impact
> - cushioning against any event that might jostle
> - any acceleration is limited to some maximum
>
> I don't see any need for individual patient monitoring but wherever they're
> housed needs to either be monitored for damage or self-repairing.
>
> Any other pertinent issues affecting the use of ultracryonics?

Yes. It's not going to happen.