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Scientists Pin Down Moon's Age, Possibly Solving Long-Running Lunar Mystery

Commented Apr 4, 2014 at 06:07:08 in Science

“GIANT IMPACT THEORY of origin of Moon- in mid-1970s,emerged.William K. Hartmann & D.R. Davis (Planetary Sciences Institute Tucson AZ) hypothesized that Earth, in course of its accumulation,underwent some major collisions with other bodies had substantial fraction of its mass and that these collision produced large vapor clouds that they believe might play a role in the formation of the Moon.A collision with a body having at least the mass of Mars would be needed to give the Earth the present angular momentum of the Earth-Moon system, In1984, scientific conference on origin of Moon was organized in, Hawaii, number of papers were discussed on various aspects of the giant impact theory.The giant impact theory emerged "fashionable" theory, but everyone agreed that it was relatively untested and that it would be appropriate to reserve judgement on it until a lot of testing has been conducted. The next step clearly called for numerical simulations on supercomputers.The Moon is computationally unique,having not more than 4% its mass in form of iron core.This contrasts with Earth, a typical terrestrial planet's bulk composition, which has about one-third of its mass in form of iron core. Thus, simulation could notbe regarded "successful" unless material left in orbit was iron free or nearly so and was substantially in excess of mass of Moon. This uniqueness highly constrains conditions that must be imposed on the planetary collision scenario. If the Moon had a composition typical of other terrestrial planets, it would be far more difficult to determine the conditions that led to its formation”

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stevensgorge on Apr 6, 2014 at 23:40:20

“Professor Pranab. I read "but everyone agreed that it was relatively untested and that it would be appropriate to reserve judgement on it until a lot of testing has been conducted till" and got all excited about smashing a few more Mars's into Earth to see what happened. Then you said numerical simulations. Pranab. That's no fun. In your otherwise interesting history, you did neglect to say that those simulations have been done and proved to be successful.”

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This 'GLIMPSE' Into Milky Way Is Clearest Tour Of Our Galaxy Yet (VIDEO)

Commented Mar 27, 2014 at 02:50:33 in Science

“Our spiral galaxy is not any thing new or special in the
Universe.
Besides our "Milky way", there are at least 63 spiral galaxies (Cataloged so far) known, who have velocities 800 Kms.l. Spiral structures has also variability, some are tightly wound, others are open spirals. IRAS study has detected a spiral galaxy with a distant red shiftZ=2.286. It is IRAS 10214+4724 galaxy with most intrinsically luminous objects in the universe α=1014LΘ (LΘ=Solar luminosity) The total mass of neutral molecular hydrogen in the IRAS 10214+4724 is 2-6 X 1011 M0. This massis compatible to total mass of a large spiral galaxy. "Co luminosity isrecent technique to estimate the H2 mass in the spiral galaxy, and IRAS10214+4724 galaxy has a Co luminosity at least 20 times than that of local
group galaxy. Its hydrogen mass is roughly equal to total mass of large spiral
galaxy like the "Milky way" (P.M. Solomon Nature vol 356, 26th March
P. 318-19, 1992). 90% of the galaxy contain stars and 10% gasses (The total
agglomeration of molecular gas in Milky way is 10 *6-10*7M0).”

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Our Universe Just May Exist In A Multiverse After All, Cosmic Inflation Discovery Suggests

Commented Mar 24, 2014 at 01:05:52 in Science

“Thanks for your comments some of my words run together this is because to share complete information by 250 characters in the comment box”

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shaaronie on Mar 24, 2014 at 16:04:17

“Oh! Very Smart! Let me be your first fan!”

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Our Universe Just May Exist In A Multiverse After All, Cosmic Inflation Discovery Suggests

Commented Mar 22, 2014 at 02:56:37 in Science

“cosmic inflation Big Bang postulates our universe under went period of extremely rapid expansion shortly after Big Bang.Present day universe would began as multiple bubbles in inflationary cosmos. One such bubbles is probably our Universe.Now, multi- universe is hot topic for discussion at conferences.Question arise whether all these other universes are like ours or whether they have different laws and laws in our universe are in some sense special.String theory suggest multiverse encompasses bubbles hosting various sorts of physics. Theory predicts existence of an enormous number of different “vacuum states,”or space time bubbles with different properties,as physical constants or particle masses. Of infinite numbers of bubbles,there be 10500 different varieties.And though any underlying basic law of physics would remain same, bubbles could nonetheless exhibit vast physical diversity.Some of bubbles would not have lasted long enough for life,inflating but then shrinking before any interesting chemistry commenced.Others would expand forever, as seems the case with bubble that humans occupy. In some, local laws of physics would have welcomed living things; others would have permitted none of the particles and forces that conspire to build atoms, molecules and metabolic mechanisms. It seems that universes come in all sizes and flavors, with the human bubble being the Goldilocks version, just right for life. In other words, if the multiverse offers multiple bubbles that permit life to evolve, humans would most likely live in an average bubble. If, for instance, you throw out all the bubbles that wouldn’t allow life anyway, and then calculate the average temperature of space in those that remain, humans should measure a cosmic temperature that is not very far off from that average. Somewhere in the cosmos, such a random mix of molecules has produced a brain identical to yours in every respect, neurons in identical configurations, with all your memories and perception”

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shaaronie on Mar 22, 2014 at 10:48:36

“Very interesting, but kind of hard to read in some spots. some of your words run together, but very informative. . Thanks!”

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'Cosmic Inflation' Discovery Lends Key Support For Theory Of Expanding Early Universe (VIDEO)

Commented Mar 18, 2014 at 05:08:26 in Science

“Finally the Hot Big Bang theory Proved?
The CMB was discovered by Penjias and Wilson in 1965both won Noble prize in physics and confirmed the hot Big Bang in Planck's moment. So long the theory was a theoretical possibility. In recent years observation on temperature an isotropy helped to refine the CDM standard cosmological model known as (V )CDM model where the universe is flat, dominated by Dark matter(MDM) with a cosmologicalconstant(V) and there was accelerated expansion in universe short time after.Inflationary model of Universe suggest ex potential expansion in the early period of the Big Bang, perturbation( adiabatic and Gaussian,scale invariant ), quantum fluctuations a little anisotropic by the expansion and a curved space time at energy 10^16 GeV and time scale 10*~32 S and stochastic Gravitational waves so generated with a characteristic shape and that probably resulted anisotropy. Now in the experiment BICEP2 the noise level of 87nK degrees in Q & U over an effective area of 380 square degrees is the real signal of lensed (V)CMB hot Big Bang and not of WAMP or dusts or galaxies
please see the Paper published
http://bicepkeck.org/b2_respap_arxiv_v1.pdf”

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