Scientists Pin Down Moon's Age, Possibly Solving Long-Running Lunar Mystery
Commented Apr 4, 2014 at 06:07:08 in Science
“GIANT IMPACTTHEORY of
origin of Moon inmid-1970s,emerged.William K. Hartmann & D.R. Davis
(Planetary Sciences InstituteTucson AZ) hypothesized that Earth, in
course of its accumulation,underwent some majorcollisions with other
bodies had substantial fraction of its mass and that these collision
produced large vaporclouds 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”
stevensgorge on Apr 6, 2014 at 23:40:20
“Darn. 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" and got all excited about smashing a few more Mars's
into Earth to see what happened. Then you said numerical simulations.
Darn. 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.”
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).”
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).”
Our Universe Just May Exist In A Multiverse After All, Cosmic Inflation Discovery Suggests
shaaronie on Mar 24, 2014 at 16:04:17
“Oh! Very Smart! Let me be your first fan!”
Our Universe Just May Exist In A Multiverse After All, Cosmic Inflation Discovery Suggests
Commented Mar 22, 2014 at 02:56:37 in Science
“cosmicinflation BigBang
postulates our universe underwentperiod ofextremely rapid
expansionshortlyafter Big Bang.Presentday universe wouldbegan as
multiple bubbles ininflationary cosmos. Onesuch bubblesis probably our
Universe.Now, multi- universeishot topic for discussion at
conferences.Question arise whetherall these otheruniverses are likeours
or whether theyhave different laws and laws in our universe are insome
sense special.String theorysuggestmultiverse encompasses bubbleshosting
varioussortsof physics. Theorypredicts existence of an enormous number
of different “vacuum states,”or space timebubbles with
differentproperties,as physical constants orparticle masses. Of
infinitenumbersof bubbles,therebe10500 differentvarieties.And though any
underlying basic law of physicswouldremain same,
bubblescouldnonethelessexhibit vast physical diversity.Someof
bubbleswouldnot havelasted longenough for life,inflating butthen
shrinkingbefore anyinteresting chemistrycommenced.Otherswould expand
forever, asseems thecase with bubble thathumansoccupy. Insome, 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”
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!”
'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://bicep
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