Planet Aqua

[DuQuense]

I read that if all earth's oceans were brought together, it would form a sphere 1/3 the size of the moon. This got me to Thinking [ouch]

5,000 yrs age the ASBs flood Mars with duplicates of earth's Ocean with all life in it.
Over & Over & Over- till it reaches Earth Gravity [along with a Copy of Earths Astrosphere [with every thing over 2 inches up except, land life] topped off with another copy of the top 250 feet,

I figure somewhere around 4.000 miles deep, this makes Mars some 12,000 in Diameter [earth is 8.000]. with a 36 hr day

This makes the planet much brighter, and visible to the naked eye back on earth, Instead of -The Red Planet- It would be -The Blue Planet-

Fast Forward 5,000 yrs.
Telescopes have known for years about Aqua's Clouds and Weather systems.
Whe have sent probes to orbit, and to splash down and float around.
Whe are preparing for the first manned Mission.

Absent something like Heinlien's floating torch Ships, ?will whe be able to return?, ?or is this a one way trip?

[eschaton]

I'm not sure if a water-world with oceans that deep will work for two reasons.

One, the pressure at the bottom of the ocean would be astounding. Even given mars having 1/3rd the gravity of earth, the density (I'm not a math wiz here) would be several hundred times that of earth. The ocean might actually be deep enough and dense enough for Ice III or some other form to solidify on the bottom. Either way, current ocean bottom life would not survive. Even bacteria might not survive. So all benthic organisms will die, and at most only the top few miles of the ocean will be habitable (given evolution, this may deepen in time, but it will take longer than 5,000 years)

The other issue, related to this, is ocean circulation. With the ocean bottom so far below, it's hard to say if the water from the ocean floor will have full convection. If there is not full circulation, the biosphere will die. Dead animals and other detritus will sink to the bottom and stay there. In addition, there will be no nutrients washing down rivers and into the ocean, naturally. The surface layers will become nutrient starved within a few generations. There will probably be life, but not that much.

[NomadicSky]

when I first saw Planet Aqua I was thinking of the Scandinavian pop band taking over the planet