I just wanted to comment on sublimation aspect. From my experience with cryo-SEM (scanning electron microscopy) operation sublimation in the vacuum (more less 5x10^-5 mBar) occurs even in lower temperatures, actually standard procedure of sublimating samples to get rid of water crystals is -90 C.
-70 C from my experience would result in very strong sublimation (half cm during the night easily).
To demonstrate how pathetic snowball theory is we even can put EU proofs for a moment aside and just use pure mainstream belief and physics laws:
Looking from technical perspective of sublimation, snowball flying in the vacuum for billions of years is impossible.
You don't need even to do any observation of comet, send expensive instruments.. the things like "very old", "snowballs", "in the vacuum/space" doesn't fit together, the concept were already completely broken the moment it were born in some heads, because either it is not snowball -- through billions of years it would completely sublimate, or either it is snowball -- but very very very very very young. If count the time from discovery (1969) we have about 45 years. from that time the comet should have sublimed more less 1km... Ok... some may argue that what we see today is what left from sublimation from this primordial comets which seeded our oceans.. blah blah... Lets do some simple calculations. Of course we will have to make some assumptions (lets assume the same way as mainstream that nothing changes from 4.4 Ga, the gravity slowly pulls things , the space is getting cooler after big bang, so the comet surface would be not colder than -90 C and.... blah blah...). Lets assume the sublimation ratio of 0.5cm/day (which is reasonable in range of -93 -- -40 C). So multiplying such sublimation ratio with 4.4Ga we get about 80 million km diameter (Now we are talking
). For comparison suns diameter is 1.4 million km. The more I look into this the more bizarre it looks especially if to add another "snowball" comets...
Of course the math is not very appropriate, but even with lower sublimation ratios the initial "Snowball" comets had to be at least size of planets.
In that case earths could seed the comet.
The conclusion is that the snowball theory is one of known "super massive black holes", it is self explanatory why mainstream astronomers can't leave its "gravitation" field.
P.S. this is my first time writing on this forum, I am sorry for my bad english