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Marijuana strain review: Platinum Moon Rocks
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How to find Platinum on Moon :: Space Engineers Survival Mode
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Our price is lower than the manufacturer's "minimum advertised price. Experts believe the moon was born after a Mars-sized object slammed into the young Earth and knocked loose a bunch of debris that coalesced into the satellite we know today. If simple physics had prevailed, the resulting moon should have been tilted by no more than 1 degree.
It's an enduring mystery. Scientists even have a name for it that sounds like the title of a Robert Ludlum novel: The lunar inclination problem. Two researchers from the Observatoire de la Cote d'Azur in France have a new theory to explain this situation. Writing in the journal Nature , they posit that the young moon was pulled out of its original orbital plane by the gravity of large objects whizzing by. In the past, scientists have considered the effects of the objects that collided with Earth.
But as Kaveh Pahlevan and Alessandro Morbidelli note, before each collision, there were probably 1, to 10, near-misses. Pahlevan and Morbidelli used computer simulations to estimate the effect of all these flybys during the first million years of the moon's history. They found that no single object would have been big enough to yank the moon out of its expected orbital plane all by itself.
But the gravity of many objects combined could have done the job. In fact, the pair calculated that their scenario works beautifully if the objects that struck Earth and added the last 0. The story not only explains the moon's odd tilt, it also accounts for the abundance of certain metals in Earth's crust - especially gold and platinum.
But enough of it exists at the surface that it must have arrived here after the core had formed. Indeed, these metals were probably delivered by "large objects left over from the formation of the inner planets," wrote Canup, who studies the origins of the solar system.
If there were many such objects, some of them should have hit the moon and deposited gold and platinum there, too. The relative dearth of these precious metals on the moon strongly suggests that Earth was hit by a few large objects rather than many small ones, she wrote. Overall, the evidence from these metals offers compelling evidence in support of Pahlevan and Morbidelli's theory that planetary dregs passing by the young moon skewed its orbital plane, she wrote. Why aren't there eclipses every month?
Collisionless encounters and the origin of the lunar inclination, Nature , DOI: If the sun, Earth and moon are lined up, shouldn't we get a lunar and solar eclipse every month? Clearly, we don't, but why not? Scientists at Southwest Research Institute combined dynamical, thermal, and chemical models of the Moon's formation to explain the relative lack of volatile elements in lunar rocks. Lunar rocks closely resemble Earth rocks The moon is tidally locked to the Earth, which means that it always shows one face to our planet. Print edition must be purchased new and sold by Amazon.
Gifting of the Kindle edition at the Kindle MatchBook price is not available. Learn more about Kindle MatchBook. Related Video Shorts 0 Upload your video. Share your thoughts with other customers.
Write a customer review. There was a problem filtering reviews right now. Please try again later. Congratulations to Bill White for researching and writing this story about an alternate future for entrepreneurial space development. The underlying theme of the book is the hypothesis that valuable minerals may have impacted upon the Moon in the past.
The recent behavior of China to limit access to its rich store of rare Earth elements makes Bill's story especially interesting. Weather you are a Space Enthusiast or Not I have read at least 15 more books since reading "Platinum Moon" and yet, I think I would recognize any one of it's characters and welcome the chance to converse with them!
A Great Read that leaves you hoping for a sequel!
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- Gold and platinum offer clues about the moon's mysterious tilt.
One person found this helpful 2 people found this helpful. The first novel about our future on the Moon written after the sea change in NASA's mission instructions directed by the Obama Administration. Rather than dwell on the doors being closed, the writer accepts this change of direction as not only irreversible but as an opportunity, and take an enthusiastic view of the possibilities it creates.
The first word in the first sentence in the novel, PGM-1, the name of a spaceship, zeroes in on the crux of the novel. They have similar physical and chemical properties, and tend to occur together in the same mineral deposits. Wikipedia "The platinum metals have outstanding catalytic properties. Most crucial, is Platinum's sine qua non role in fuel cells, without which the ultra-clean "Hydrogen Economy" would remain a dream.
The hitch is that no PGMs have yet been detected on the Moon. That does not mean they are not there. To be detected from orbit at relatively low resolution, they would have to be present in abundance. Nor have PGMs been detected in Apollo moon dust and rock samples except in parts per billion.
But the thinking is that while PGMs may not be native to the Moon, there could be PGM-rich meteorite chunks on the lunar surface that could be detected by on-location prospecting. The payoff could be immense, not just for export to Earth, but to fully enable modern industrial and manufacturing operations on the Moon itself.
Without PGMs, or with PGMs imported at great cost, lunar industrialization will proceed, but remain on a relatively crude midth century level. This novel is powered by hope and faith that we will find such resources. That we have not done so to date, is understandable.