🚀 go-pugleaf

The perfectly good what-if of a given 4X or 5X solar mass, such as
from that original Sirius B, kicking out a few assorted Oort cloud
items while going red-giant, as such isn't all that unlikely.  In
fact, it seems entirely more common place and therefore more likely
than not, especially as our Sol gets within better range of using our
somewhat wussy gravity to further attract upon whatever's headed our
way.

(Milky Way's 225MY cycle indicates more frequent local stellar cycles)
The Geneva-Copenhagen survey of the Solar neighbourhood, by Nordström
et al., as having been further improved by Hipparcos data:
http://www.aanda.org/index.php?option=com_content&task=view&id=71&Itemid=42&lang=en

Of whatever ice survives in interstellar space, especially as for
eventually cruising anywhere near 1AU of a Sol like star, as such
requires a fairly substantial volume and/or gravity worthy core of
rock (perhaps not unlike 7.35e22 kg), and otherwise hosting some
degree of a protective atmosphere, even if such an atmosphere is
primarily sustained via those icy vapors.

I've asked of others;  What is the "R" value of ice as insulation?
>> Eric Swanson:
>> Thermal Conductivity, Ice at 0 C = 2.22 (W/m K)
>>
>> Data for other temperatures found here:
>> http://www.engineeringtoolbox.com/ice-thermal-properties-d_576.html

Thermal Conductivity of -0°C ice = 2.22 (W/m K)  ~  (R/m/K = 0.45)
Thermal Conductivity of -5°C ice = 2.25 (W/m K)  ~  (R/m/K = 0.444)
Thermal Conductivity of -10°C ice = 2.3 (W/m K)  ~  (R/m/K = 0.435)
Thermal Conductivity of -30°C ice = 2.5 (W/m K)  ~  (R/m/K = 0.4)

In a few other honestly deductive words of my best dyslexic encrypted
wisdom, whereas an ejected icy covered proto-moon is entirely livable
if you are adequately sequestered within/under such a protective layer
of ice, especially on behalf of sufficiently intelligent folks, plus
all sorts of other DNA that'll survive such an extended interstellar
trek, such as getting safely away from that white dwarf of a star that
used to be of a 4X or greater solar mass to begin with.

Just 100 meters of -30°C ice is good for insulating: 250 W/K
1 km of that same -30°C ice is good for insulating: 2.5 KW/K
100 km of -30°C ice becomes worthy of insulating at 250 KW/K

Obviously the thermal conduction of such ice is less for what's
existing directly upon or near the rocky surface, as is the more
thermally conductive ice and snow that's likely capable of being
something near 45 K (-228°C) of what the very worse of such a local
interstellar trek would likely amount to, with an average interstellar
medium of perhaps something less than 98 K (-175°C).

Unfortunately, I'm still that village idiot or pesky messenger from
hell that's suggesting our icy proto-moon as having arrived in a
lithobraking fashion, though only as of the last ice age this planet
will ever see, while packing along as much as 262 km worth of surface
ice and/or as having collected such volumes of compacted salty Oort
snow on deck.

Perhaps you folks can manage to further add or subtract your best
swag, as to the what-if of this analogy that's pretty much all Guth
going yaysay postal, as to my limited mindset favoring a good deal of
panspermia influx, up to that of a full blown intelligent design
effort that obviously hasn't turned out quite as well as originally
planned.
-
Brad Guth