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Pages: 1 Carol L Reged: 07/05/04 Loc: Tomahawk, WI 45N//89W Origin of the Moon       #5239718 - 05/25/12 08:55 PM Edit   Reply   Quote Quick Reply   It's generally accepted that the Moon was formed when a Mars-sized object collided with Earth, but a recent study suggests otherwise... quite an interesting article. Titanium paternity test fingers Earth as moon’s sole parent Post Extras:       d.sireci51 Arachnoid Reged: 11/19/09 Loc: The Tholian Web [S. Wisconsin] Re: Origin of the Moon [Re: Carol L]       #5239795 - 05/25/12 09:49 PM Edit   Reply   Quote Quick Reply   Interesting reading Carol. Thanks. Looks like they may have to find a new theory? Post Extras:       davidmcgo scholastic sledgehammer Reged: 10/09/04 Loc: San Diego, CA Re: Origin of the Moon [Re: d.sireci51]       #5240535 - 05/26/12 11:40 AM Edit   Reply   Quote Quick Reply   What if both Earth and the Moon ended up with mixture of both bodies titanium isotopes? Wouldn't they still look the same? Dave Post Extras:       brianb11213 Postmaster Reged: 02/25/09 Loc: 55.215N 6.554W Re: Origin of the Moon [Re: davidmcgo]       #5240584 - 05/26/12 12:12 PM Edit   Reply   Quote Quick Reply   Quote: What if both Earth and the Moon ended up with mixture of both bodies titanium isotopes? Wouldn't they still look the same? Alternatively, why shouldn't proto-Earth and impactor - formed in the same region of the nascent Solar System from the same raw materials - have a similar composition? You probably need to invoke a "nearby origin" to account for the impact occurring. Post Extras:       azure1961p Postmaster Reged: 01/17/09 Loc: USA Re: Origin of the Moon [Re: brianb11213]       #5240590 - 05/26/12 12:15 PM Edit   Reply   Quote Quick Reply   That was a nice read. Thanks Carol. Pete Post Extras:       BillFerris Post Laureate Reged: 07/17/04 Loc: Flagstaff, Arizona, USA Re: Origin of the Moon [Re: brianb11213]       #5240933 - 05/26/12 04:05 PM Edit   Reply   Quote Quick Reply   In fact, William Hartmann's and Don Davis' 1975 paper (Icarus) presenting the giant impactor theory for the creation of the Moon was a byproduct of modelling the authors had done to plausibly demonstrate the 2nd-largest, 3rd-largest, etc. bodies that would have formed in the same heliocentric orbits as the major planets. Their work suggested an object 1/4 to 1/2 the size of Earth could have formed in and shared Earth's orbit. Having formed at the same distance from the Sun, the impactor would have had a mantle composition similar to Earth. There are many questions remaining to be answered with respect to the giant impactor theory of the origin of the Moon. The Zhang, et al article contributes to the discussion but I don't see it as causing significant problems for the impactor theory. Bill in Flag Quote: Quote: What if both Earth and the Moon ended up with mixture of both bodies titanium isotopes? Wouldn't they still look the same? Alternatively, why shouldn't proto-Earth and impactor - formed in the same region of the nascent Solar System from the same raw materials - have a similar composition? You probably need to invoke a "nearby origin" to account for the impact occurring. Post Extras:       d.sireci51 Arachnoid Reged: 11/19/09 Loc: The Tholian Web [S. Wisconsin] Re: Origin of the Moon [Re: BillFerris]       #5241576 - 05/27/12 12:33 AM Edit   Reply   Quote Quick Reply   Quote: In fact, William Hartmann's and Don Davis' 1975 paper (Icarus) presenting the giant impactor theory for the creation of the Moon was a byproduct of modelling the authors had done to plausibly demonstrate the 2nd-largest, 3rd-largest, etc. bodies that would have formed in the same heliocentric orbits as the major planets. Their work suggested an object 1/4 to 1/2 the size of Earth could have formed in and shared Earth's orbit. Having formed at the same distance from the Sun, the impactor would have had a mantle composition similar to Earth. There are many questions remaining to be answered with respect to the giant impactor theory of the origin of the Moon. The Zhang, et al article contributes to the discussion but I don't see it as causing significant problems for the impactor theory. Bill in Flag Quote: Quote: What if both Earth and the Moon ended up with mixture of both bodies titanium isotopes? Wouldn't they still look the same? Alternatively, why shouldn't proto-Earth and impactor - formed in the same region of the nascent Solar System from the same raw materials - have a similar composition? You probably need to invoke a "nearby origin" to account for the impact occurring. Except that the research team found no evidence in their analysis of the Titanium isotopes, from the Earth and Moon, that an impactor source could have existed. They found only one parient planet for the Moon. A problematic explanation remains. D.Sireci Post Extras:       ages0ne member Reged: 10/29/10 Loc: CO, USA Re: Origin of the Moon [Re: d.sireci51]       #5258780 - 06/06/12 05:57 PM Edit   Reply   Quote Quick Reply   Come on now... we all have noses, which means we should all no that Abracadabra is the Origin of la Luna. plus this book (http://www.tor.com/stories/2011/08/what-if-the-earth-had-two-moons-excerpt) points toward that same theory of a 'Mars sized object' striking the Earth, forming a ring that eventually formed Earth's meteorite/tide observing neighbor. & i wanna second my 'theory' of there being some tiny objects that circle la Luna on a nightly basis (plus they even have phases of their own....) --loony Edited by ages0ne (06/06/12 05:58 PM) Post Extras:       Stellarfire Pooh-Bah Reged: 07/10/11 Loc: Switzerland Re: Origin of the Moon [Re: ages0ne]       #5259441 - 06/07/12 04:31 AM Edit   Reply   Quote Quick Reply   Quote: plus this book (http://www.tor.com/stories/2011/08/what-if-the-earth-had-two-moons-excerpt) --loony working link Stephan Post Extras:       Centaur Vendor Reged: 07/12/04 Loc: Chicago Re: Origin of the Moon [Re: BillFerris]       #5260806 - 06/07/12 08:48 PM Edit   Reply   Quote Quick Reply   Quote: In fact, William Hartmann's and Don Davis' 1975 paper (Icarus) presenting the giant impactor theory for the creation of the Moon was a byproduct of modelling the authors had done to plausibly demonstrate the 2nd-largest, 3rd-largest, etc. bodies that would have formed in the same heliocentric orbits as the major planets. Their work suggested an object 1/4 to 1/2 the size of Earth could have formed in and shared Earth's orbit. Having formed at the same distance from the Sun, the impactor would have had a mantle composition similar to Earth. There are many questions remaining to be answered with respect to the giant impactor theory of the origin of the Moon. The Zhang, et al article contributes to the discussion but I don't see it as causing significant problems for the impactor theory. Indeed, Bill, the current impactor theory includes the concept of that impactor having formed in essentially the same orbit as the Earth but at the Lagrangian point 60° ahead. The cumulative effect of perturbations due to Jupiter are thought to have destabilized the impactor and sent it careening into Earth. If the impactor formed in the Earth's orbit, then we should not be surprised if both bodies accumulated similar chemical compositions. Post Extras:       Pages: 1

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