This is a spectroscope:
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A spectrograph, of water vapor, I believe:
image. Ice also has a characteristic reading, and we've detected both literally everywhere in the universe we look. But hey, as seeing is believing, I'll let the photos speak for themselves from this point on.
A very large frozen lake in a crater on Mars:
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Layers of water-ice, mixed with sand, in the Martian north polar ice cap:
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Frozen Martian sea, under protective dirt layer. GIS and compare with ocean pack-ice on Earth:
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Pretty sure that none of the ice you're seeing came from Earth, Dave.
And here is a science report detailing the detection of hydrated surface minerals on Mars by the spectrographs aboard the martian rover at Meridiani Planum.
Martian "blueberries." These things form on Earth, too, but only in places where liquid water flows through rocks.
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Here's some clouds on Mars. Looks a lot like what we've got on Earth, too. Made of the same thing:
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Mars' atmosphere is at 100% relative humidity--it can't hold any more water vapor at its current pressure. Direct measurement by everything from satellites to probes on the ground show it's loaded with water vapor.
A rover photo, showing sulfate salts in the tracks Spirit left. The soil on Mars is over 50% salt. You only get salt when igneous rocks erode in the presence of water:
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An image of the dwarf-planet Ceres by the Hubble Space Telescope, which indicates it has a shiny, thick crust of dusty ice:
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And we'll have a probe orbiting the planet in a few years to directly measure and map it. It's not from this planet, Dave.
Pack ice on Europa, a Jovian moon:
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Very few visible craters, and those few it has are really young--everything that hits it breaks through into the sea underneath, and the crater gets filled in fast. And there's very few mountains or high ridges--the crust is too thin and ice is too soft to support very high surface features. And the ice is loaded with colorful salt, too.
There's also indirect evidence of magnetic fields associated with convection in a salt-water ocean under the ice, detected by the Galileo probe, along with gravitational anomalies suggestive of liquid water. Lots and lots of it. Not speculation--hard, proven science, confirmed over and over again on Earth. Considering how much of it there is, it seems kind of unlikely it came from Earth, Dave.
Further, Galileo got the exact same readings from both Ganymede:
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...and Callisto:
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...both of which have very smooth crusts of ice with few shallow craters relative to a rocky body's surface, suggesting that they have their own active oceans beneath the surface ice. Pretty sure it's not our water, Dave.
Water-ice "rocks" on Titan, directly measured and photographed by the Huygens probe. Note the well-rounded shapes, suggesting erosion by liquids *other* than water, which is a stony solid at those temperatures:
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As an interesting sidenote, the obvious erosive agent would be liquid ethane and methane--they rain out there, and there's some really huge lakes of what amounts to liquid natural gas at at least one pole.
There's also water vapor in the atmosphere, suggesting something's continuously producing it. Ice sublimates into vapor, slowly, even as cold as Titan is.
There's more water vapor that even sublimation can account for, too..
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So there's a good chance that there's pressurized liquid beneath the surface, erupting periodically and building up mounds. There's some ammonia there, too...and we know that mixing ammonia with water lowers the freezing point of water. So if there's any heat under the surface at all, ammonia will let water stay liquid, at least until it hits the surface. So that's at least four iceballs with subsurface oceans of water. Not from here, Dave.
Erupting water vapor plumes from the south pole of Enceladus, directly measured and imaged by Cassini Probe--to wit, the probe went sailing directly through the plumes. I'm fairly certain it doesn't come from here, either:
image there's a heat source there that melts water, at least enough for some of it to blast to the surface and out into space.
I could go on and on and on, but I think I'll stop there. Do you really think all of this water come from Earth? That's an awful lot of water, and a lot of it is really, really far from here, don't you think?
Conclusion: we have the hard evidence that proves you're a moron, Dave.
