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Re: Speculation on water loss
Posted By: Dwain	Date: 9/29/03 7:37 a.m.
In Response To: Speculation on water loss (Grady) : Hi all, : I think I have another possible explanation why the water level on Halo seems : to have fallen. It may be because Halo can't hold hydrogen. : On planets, water is slowly lost by water vapor in the upper atmosphere being : dissociated into hydrogen and oxygen by ultraviolet light. Mostly the H2 : and O2 gas recombine into water (or go off and become part of some other : compound), but H2 has a very low molecular weight, so H2 molecules at a : given temperature are moving quite fast -- fast enough that some of them : on the far tail-end of the velocity distribution will have escape velocity : and, barring collisions with other molecules, will leave the planet : forever. Once that happens, the water molecule that hydrogen came from can : never re-form. (Oxygen and most other gases are heavy enough that they : can't do this trick on a Earth-sized world, and the hydrogen loss is also : very slow on Earth. IIRC Mars, on the other hand, lost a lot of water this : way...) : What does this mean for Halo? Depending on how it gets its gravity : (artificial gravity seems likely to me, but I don't know if there's any : conclusive evidence either way), it's probably much easier for gases to : escape Halo than any planet. I suspect that Halo can't hold any atmosphere : over geologic time, and it seems likely that, compared to a planet, it : would leak hydrogen like a sieve, leading to the fall in water levels that : others have noticed on levels such as 343 Guilty Spark. : --Grady I dont knoow if this has allready been posted, but on the second to last page on the fall of reach, cortana says halo has a artificial gravity field which keeps the atmosphere in.

Message Index

Speculation on water loss	Grady	9/25/03 1:29 a.m.
Re: Speculation on water loss	Infininja	9/25/03 3:58 p.m.
Re: Speculation on water loss	Grady	9/25/03 4:59 p.m.
Re: Speculation on water loss	Infininja	9/25/03 5:55 p.m.
Re: Speculation on water loss	AlianAnt	9/25/03 6:05 p.m.
Re: Speculation on water loss	Infininja	9/25/03 6:12 p.m.
Re: Speculation on water loss	Grady	9/25/03 10:14 p.m.
Re: Speculation on water loss	Viscily II	9/29/03 6:54 p.m.
Re: Speculation on water loss	Micahst	9/25/03 8:56 p.m.
Re: Speculation on water loss	Micahst	9/25/03 9:02 p.m.
Re: Speculation on water loss	Plastic Chicken	9/25/03 10:43 p.m.
Re: Speculation on water loss	Plastic Chicken	9/25/03 10:46 p.m.
Re: Speculation on water loss	Infininja	9/25/03 10:54 p.m.
Re: Speculation on water loss	Plastic Chicken	9/27/03 10:01 p.m.
Re: Speculation on water loss	Grady	9/26/03 12:16 a.m.
Re: Speculation on water loss	Grady	9/26/03 2:09 a.m.
Re: Speculation on water loss	Infininja	9/26/03 7:19 a.m.
Re: Speculation on water loss	Grady	9/26/03 12:12 p.m.
Re: Speculation on water loss	Infininja	9/26/03 1:21 p.m.
Re: Speculation on water loss	Plastic Chicken	9/28/03 1:25 a.m.
I meant m/s/s *NM* *NM*	Plastic Chicken	9/28/03 2:06 a.m.
Re: Speculation on water loss	Dwain	9/29/03 7:37 a.m.
Re: Flood alter the atmosphere?	Wado SG	9/29/03 1:21 p.m.