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Astro Biology

Earth's magnetic field has flipped - 0 views

www.astrobio.net/...eld-flip-within-human-lifetime

news from nasa solar system planets in our

shared by Astro Biology on 20 Oct 14 - No Cached
  • Astro Biology on 20 Oct 14
     
    The new discovery indicates that the intensity of Earth's magnetic field is decreasing 10 times faster, leading some geophysicists to predict a reversal within a few thousand years.
  • Astro Biology on 20 Oct 14
     
    The new discovery indicates that the intensity of Earth's magnetic field is decreasing 10 times faster, leading some geophysicists to predict a reversal within a few thousand years.
Todd Suomela

[0806.0377] A Hemispherical Power Asymmetry from Inflation - 0 views

arxiv.org/0806.0377

astronomy astrophysics observatory physics

shared by Todd Suomela on 13 Jun 08 - Cached
  • Todd Suomela on 13 Jun 08
     
    Measurements of temperature fluctuations by the Wilkinson Microwave Anisotropy Probe (WMAP) indicate that the fluctuation amplitude in one half of the sky differs from the amplitude in the other half. We show that such an asymmetry cannot be generated during single-field slow-roll inflation without violating constraints to the homogeneity of the Universe. In contrast, a multi-field inflationary theory, the curvaton model, can produce this power asymmetry without violating the homogeneity constraint. The mechanism requires the introduction of a large-amplitude superhorizon perturbation to the curvaton field, possibly a pre-inflationary remnant or a superhorizon curvaton-web structure. The model makes several predictions, including non-Gaussianity and modifications to the inflationary consistency relation, that will be tested with forthcoming CMB experiments.
Maluvia Haseltine

Study plunges standard Theory of Cosmology into Crisis - 0 views

www.physorg.com/print160726282.html

Astrophysics

shared by Maluvia Haseltine on 25 Jul 09 - Cached
  • Maluvia Haseltine on 25 Jul 09
     
    As modern cosmologists rely more and more on the ominous "dark matter" to explain otherwise inexplicable observations, much effort has gone into the detection of this mysterious substance in the last two decades, yet no direct proof could be found that it actually exists. Even if it does exist, dark matter would be unable to reconcile all the current discrepancies between actual measurements and predictions based on theoretical models. Hence the number of physicists questioning the existence of dark matter has been increasing for some time now.
Todd Suomela

[0904.0402] A thermodynamic basis for prebiotic amino acid synthesis and the nature of ... - 0 views

arxiv.org/0904.0402

arxiv astrobiology exobiology astronomy biology

shared by Todd Suomela on 07 Apr 09 - Cached
Andres Ruiz liked it
  • Todd Suomela on 07 Apr 09
     
    Of the twenty amino acids used in proteins, ten were formed in Miller's atmospheric discharge experiments. The two other major proposed sources of prebiotic amino acid synthesis include formation in hydrothermal vents and delivery to Earth via meteorites. We combine observational and experimental data of amino acid frequencies formed by these diverse mechanisms and show that, regardless of the source, these ten early amino acids can be ranked in order of decreasing abundance in prebiotic contexts. This order can be predicted by thermodynamics. The relative abundances of the early amino acids were most likely reflected in the composition of the first proteins at the time the genetic code originated. The remaining amino acids were incorporated into proteins after pathways for their biochemical synthesis evolved. This is consistent with theories of the evolution of the genetic code by stepwise addition of new amino acids. These are hints that key aspects of early biochemistry may be universal.
hanz444

Einstein's Theory of General Relativity - 0 views

www.space.com/theory-general-relativity.html

astronomy science space universe planetary solar galactic astrophysics Physics

shared by hanz444 on 22 Sep 15 - No Cached
  • hanz444 on 22 Sep 15
     
    Einstein's theory of general relativity predicted that the space-time around Earth would be not only warped but also twisted by the planet's rotation. Gravity Probe B showed this to be correct.Credit: NASA In 1905, Albert Einstein determined that the laws of physics are the same for all non-accelerating observers, and that the speed of light in a vacuum was independent of the motion of all observers.
Todd Suomela

Guest Post: Evalyn Gates on Cosmic Magnification (or - Invasion of the Giant Blue Space... - 0 views

blogs.discovermagazine.com/...f-the-giant-blue-space-amoebas

astronomy astrophysics gravity-lens physics science gravity methods

shared by Todd Suomela on 19 Jul 09 - Cached
  • This is not just a pretty picture, however – the image packs a lot of scientific information. The authors extract the mass distribution in the cluster (which has implications for cosmological models), measure the mass-to-light ratio of the bright galaxy in the center of the cluster, and use the magnifying power of the lens to search for even more distant galaxies. The basic idea is to construct a model of the lens, starting with the cluster galaxies and a dark matter halo; then refine the model to reproduce the multiple images that are seen. Using this refined model it’s possible to predict the location of additional images of a given source, and to identify regions of high magnification that can then be examined for multiple images of other sources. Any additional images that are found can be used to further refine the model and so on.
  • This galaxy has been lensed by the warp in spacetime created by the cluster. Light from the galaxy, which lies almost directly behind the center of the cluster but much farther away from us, travels along several curved paths through the cluster lens, producing multiple magnified images of the galaxy. The inset box shows a computer generated model of the unlensed source galaxy, enlarged by a factor of four so that the details, including the spiral arm structure, are visible. Without the lensing power of the cluster, we would see this galaxy as a single small blue smudge. In general, lensing will both magnify and distort (shear) images of a background source. This lens is fairly unique in that we see large but relatively intact images of the spiral galaxy, which implies that the mass distribution in the central region of the cluster must be nearly uniform.
Sandra Flores

Star Formation - 0 views

Heated gas stream at a cool star formation?In the inner regions of a galaxy cluster, astronomers found by Michael McDonald from the Massachusetts Institute of Technology in the USA further evidence...

stars cosmos astronomy

started by Sandra Flores on 02 Nov 14 no follow-up yet
Sandra Flores

Comet Lovejoy visible in the night sky - 0 views

Observing Tip: Comet Lovejoy visible in the night skyLovejoy has developed over the past few weeks, far better than predicted - the chances of being able to see him in January with the naked eye, a...

started by Sandra Flores on 05 Jan 15 no follow-up yet
Sandra Flores

Periodic Table of Elements completed ? - 0 views

Is the Periodic Table of Elements wholly or could it still be unknown elements in the universe?In the periodic table of the elements, the chemical elements are listed according to their atomic numb...

started by Sandra Flores on 05 Jan 15 no follow-up yet
Sandra Flores

Experimental Demonstration of space-time distortion - 0 views

Experimental Demonstration of space-time distortionAccording to the general theory of relativity deform very large rotating masses spacetime around him. This Frame-dragging was detected by the sate...

started by Sandra Flores on 05 Jan 15 no follow-up yet
Sandra Flores

Strange stars on the heel - 0 views

Strange stars on the heelA new star strange lurks perhaps in our galaxy - and an astrophysicist at the Weizmann Institute is close on the track. Prof. Vladimir Usov from the Weizmann Institute...

started by Sandra Flores on 05 Jan 15 no follow-up yet
Sandra Flores

Periodic Table of Elements completed ? - 0 views

Is the Periodic Table of Elements wholly or could it still be unknown elements in the universe?In the periodic table of the elements, the chemical elements are listed according to their atomic numb...

started by Sandra Flores on 09 Jan 15 no follow-up yet
Sandra Flores

Comet Lovejoy visible in the night sky - 0 views

Observing Tip: Comet Lovejoy visible in the night skyLovejoy has developed over the past few weeks, far better than predicted - the chances of being able to see him in January with the naked eye, a...

started by Sandra Flores on 09 Jan 15 no follow-up yet
Sandra Flores

Experimental Demonstration of space-time distortion - 0 views

Experimental Demonstration of space-time distortionAccording to the general theory of relativity deform very large rotating masses spacetime around him. This Frame-dragging was detected by the sate...

started by Sandra Flores on 09 Jan 15 no follow-up yet
Sandra Flores

Strange stars on the heel - 0 views

Strange stars on the heelA new star strange lurks perhaps in our galaxy - and an astrophysicist at the Weizmann Institute is close on the track. Prof. Vladimir Usov from the Weizmann Institute...

started by Sandra Flores on 09 Jan 15 no follow-up yet
Sandra Flores

Archaeology in the universe - 0 views

image

started by Sandra Flores on 30 Oct 14 no follow-up yet
ladypersephone

best online psychics in Los Angeles - 0 views

Psychic clairvoyant clairaudient clairsentient empath reading spirit angels predictions terminology

shared by ladypersephone on 15 May 17 - No Cached
  • ladypersephone on 15 May 17
     
    Lady Persephone is a professional empath, clairvoyant, clairsentient & clairaudient. Seek me for I will lead you past uncertainty, sorrow, and desperation.
ladypersephone

Phone Readings Online by Lady Persephone.pdf - 0 views

Psychic clairvoyant clairaudient clairsentient empath reading spirit angels predictions terminology

shared by ladypersephone on 30 May 17 - No Cached
  • ladypersephone on 30 May 17
     
    Get live advice today from LadyPersephone in Love & Relationships. Immediate and powerful insights 24/7 via phone, chat and email. More info: http://www.ladypersephone.com/
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