Dawn Spacecraft Finds Signs of Water On Vesta 33
ananyo writes "Vesta, the second-most-massive body in the asteroid belt, was thought to be bone dry. But NASA's Dawn spacecraft has found evidence that smaller, water-rich asteroids once implanted themselves in Vesta's surface. The water stays locked up in hydrated minerals until subsequent impacts create enough heat to melt the rock and release the water as a gas, leaving pitted vents in the surface. The discovery shows that yet another body in the inner Solar System has a water cycle."
Behold! (Score:1, Funny)
No water cycle... (Score:3, Informative)
Water cycle assumes that the water is reused... but nothing can return the water back to the asteroid after it evaporates... Only a supply of more water from other impacts is possible.
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Other than, you know, gravity.
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Greater than the gravitational pull of your mother, and we all know SHE retains water.
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Considering that Mars' gravity is only barely sufficient, I'm going with an asteroid's is not. Even Earth's gravity would likely be insufficient if not for our magnetosphere shielding the atmosphere from most of the solar wind.
Re:water water? (Score:5, Informative)
NASA is notorious for stating "water" interchangeably with the fluid state of gasses. This is cause the wild cry of "WATER" fuels media cycles and helps to obtain and justify project funding,
First of all, you could comment with somewhat less flame-bait (it usually isn't NASA that does that but the media itself)... but yes, they found evidence of actual water. Not proof, mind you, since they didn't actually land and take a sample, but they found an excess of hydrogen and certain surface features that are characteristic of water. It's possible all that is caused by something besides water, but it's most likely water.
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Would you prefer they say they found DHMO?
I mean, for public release, saying "water" makes more sense.
And anyway, water consumption for human use would be minimal, if it all. That water, unless it is deep underground, has been bombarded by cosmic rays for eons, it may be too radioactive in the form of Tritium to be safe.
Most likely, it will be used as fuel/reaction mass or as shielding from Cosmic Rays..
Re:water water? (Score:4, Informative)
And anyway, water consumption for human use would be minimal, if it all. That water, unless it is deep underground, has been bombarded by cosmic rays for eons, it may be too radioactive in the form of Tritium to be safe.
Cosmic rays form tritium on Earth via high energy neutrons interacting with atmospheric nitrogen. Tritium could not be produced in such a manner on an asteroid and gaseous tritium would escape into space near instantly.
Tritium has a half life of less than 12.5 years, so it could not accumulate without constant production.
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"NASA is notorious for stating "water" interchangeably with the fluid state of gasses." -- for the claim of 'notorious' to be true, someone other than the vast masses of scientifically literate, engaged tea-party patriots in your own mind would have to know about it. Cite or GTFO.
Left orbit earlier this month (Score:5, Informative)
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interesting article (Score:5, Informative)
Of course there's water (Score:3)
Nobody read Marooned Off Vesta [wikipedia.org]? By tyhe end of the story and since it was written in 1938 I'd expect some of the water would have made it there....
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I see you missed the story when the probe launched? I submitted that one, which was posted. The headline was "Marooned off Vesta" and I mentioned at the end of the summary that it was a nod to my favorite author.
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Well we got that going for us. Which is nice.
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Nobody read Marooned Off Vesta [wikipedia.org]? By tyhe end of the story and since it was written in 1938 I'd expect some of the water would have made it there....
One of the first "hard" sf stories I ever read.
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not news - solar system full of ice & snowball (Score:3)
the earth was provided with water by ice and snowballs: the comets. there are plenty of those flying around, not surprising there would be water anywhere and almost everywhere in the solar system. even mercury has ice in craters that never get exposed to sun
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Yeah, but that was 4.5 billions of years ago, almost 1/3 the age of the entire universe. Suns have been born, lived their lives, and exploded to scatter their heavy elements across the cosmos since then. A lot can happen on those kinds of timescales, so it's not necessarily safe to assume that the solar system is still in the same state. Moreover ice sublimates at about -60C in a vacuum, so it isn't terribly stable in the inner solar system.
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Comets. Icebergs of the sky. By jackknifing from one to the next at breakneck speed, we might get some kind of gravity boost ... or something.
Hurry before the red team gets there! (Score:1)
Ding ding ding ding ding. Your robots have discovered water on a large asteroid with gravity. Move colony ship to colonize? Yes/No
Read it was Water on Vista (Score:1)