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One reason to suspect that Phobos is not a captured asteroid is its density. Analysis of Mars Express radio science data gave new information about the mass of Phobos based on the gravitational attraction it exerts on the spacecraft. The team concluded that Phobos is likely to contain large voids, which makes it less likely to be a captured asteroid. Its composition and structural strength seem to be inconsistent with the capture scenario. It is possible that Phobos formed in situ at Mars, from ejecta from impacts on the Martian surface, or from the remnants of a previous moon which had formed from the Martian accretion disc and subsequently collided with a body from the asteroid belt. Data from the Mars Express OMEGA spectrometer suggests Phobos has a primitive composition, so primitive materials must have been available for accretion during its formation. The circular orbit suggests that Phobos formed in situ whilst analysis of the Planetary Fourier Spectrometer data from Mars Express also points towards in situ formation but does not rule out the possibility that Phobos is a captured achondrite-like meteor.
Originally posted by AthlonSavage
Didnt Carl Sagan say any hollow body orbiting a planet cant be natural?
In Carl Sagan's treatise, Intelligent Life in the Universe, the famous astronomer stated, "A natural satellite cannot be a hollow object."
Originally posted by HairlessApe
Originally posted by AthlonSavage
Didnt Carl Sagan say any hollow body orbiting a planet cant be natural?
Had to look this up for myself. Looks like you're right.
In Carl Sagan's treatise, Intelligent Life in the Universe, the famous astronomer stated, "A natural satellite cannot be a hollow object."
Huh. Interesting.
Originally posted by OccamsRazor04
Originally posted by HairlessApe
Originally posted by AthlonSavage
Didnt Carl Sagan say any hollow body orbiting a planet cant be natural?
Had to look this up for myself. Looks like you're right.
In Carl Sagan's treatise, Intelligent Life in the Universe, the famous astronomer stated, "A natural satellite cannot be a hollow object."
Huh. Interesting.
Much like anything else, saying can't is just asking to be wrong. Unlikely, yes, I would definitely never say can't. Moot point though, as Phobos is not hollow.
Originally posted by OccamsRazor04
reply to post by HairlessApe
No, zero scientists are calling this 20-50% "hollow". They are calling it "porous". I won't insultyour intelligence by assuming you can not understand the difference.
New values for the gravitational parameter (GM=0.7127 ± 0.0021 x 10-³ km³/s²) and density of Phobos (1876 ± 20 kg/m³) provide meaningful new constraints on the corresponding range of the body’s porosity (30% ± 5%), provide a basis for improved interpretation of the internal structure. We conclude that the interior of Phobos likely contains large voids.
Originally posted by HairlessApe
Originally posted by OccamsRazor04
reply to post by HairlessApe
No, zero scientists are calling this 20-50% "hollow". They are calling it "porous". I won't insultyour intelligence by assuming you can not understand the difference.
You're making it sound like it's a simple matter of the object's density being incredibly low, which if I'm not mistaken, is not the case. They were saying there's 20 - 50+ % of open chamber inside of the external shell, yes?
So I think the size of these chambers, their location, shape, origin, and so forth are in question for a good reason - it's an anomaly that isn't easily explained by our current understanding of celestial bodies and it requires investigation at the very least.
ETA:
New values for the gravitational parameter (GM=0.7127 ± 0.0021 x 10-³ km³/s²) and density of Phobos (1876 ± 20 kg/m³) provide meaningful new constraints on the corresponding range of the body’s porosity (30% ± 5%), provide a basis for improved interpretation of the internal structure. We conclude that the interior of Phobos likely contains large voids.
Actually they are saying "hollow." In fact, they're saying "void."
How porous Phobos is was just one of the variables in figuring out how hollow it is. Meaning 0 scientists were bringing attention to how porous it is.
edit on 8-12-2012 by HairlessApe because: ETA
provide meaningful new constraints on the corresponding range of the body’s porosity
Meaning 0 scientists were bringing attention to how porous it is.
We conclude that the interior of Phobos likely contains large voids.
Originally posted by HairlessApe
reply to post by OccamsRazor04
k how about some information that's relevant?
SCIENTISTS ANNOUNCE CAVERNS ON MAR'S MOON? Are you seriously suggesting that's their announcement? It's not. Stop talking, please. I'm not interested in your uncanny ability to detect adjectives and add nothing of value to this conversation.
Go read a book, you lepton.edit on 8-12-2012 by HairlessApe because: (no reason given)
Originally posted by TRUELIES11
Imagine the "leap" people would take with the arrival of the contents of a city sized doomsday vault on Phobos or Mars. The opposite of what people thought they should do. The idea was to find the vault, not build a vault. The next step for people with the help of a past civilization.
Seeds. Imagine where that could take you.
History. It would send people into a frenzy. That in itself would change the civilization. The change people have been waiting for.
Medicine. Can you imagine?
If people were to find such a vault on Mars or Phobos, it would in a sense be like a time machine with how the contents would inspire the civilization. It could propel the civilization thousands of years into the future.
edit on 7-12-2012 by TRUELIES11 because: (no reason given)
Originally posted by babybunnies
beforeitsnews.com has about as much credibility as Wikipedia for a source of information, probably a lot less.
Originally posted by schuyler
Originally posted by babybunnies
beforeitsnews.com has about as much credibility as Wikipedia for a source of information, probably a lot less.
Oh, I agree completely with everyone here who has and will point that out, but this story (Aldrin) has been out there well before this outfit got wind of it. It's not new and Aldrin has mentioned it several times. Reminds me of the John Glenn episode on Frazier.edit on 12/8/2012 by schuyler because: (no reason given)
No, zero scientists are calling this 20-50% "hollow". They are calling it "porous". I won't insultyour intelligence by assuming you can not understand the difference.
Originally posted by Helious
reply to post by OccamsRazor04
No, zero scientists are calling this 20-50% "hollow". They are calling it "porous". I won't insultyour intelligence by assuming you can not understand the difference.
Actually, stating that it is likely to contain large voids doesn't translate to porous. Remember that we are talking about an object that is 22km in diameter and that being the case, should there in fact be "large voids" or as you said yourself, substantial caverns it would still be rather exciting.
The best use of Phobos regardless of how it came into orbit around Mars would be as a stepping stone for future human missions and if it came pre made with large enough voids or caverns to house mission personal and equipment that would be fantastic! Assuming of course, it's not a giant alien seed bank!
The most beautiful women of the mars people were transported to earth for safety....