Our universe is actually constructed of a small number of building blocks that interact in a small number of well...... Read more »
The Center of Astrophysics of the University of Porto recently came up with an analysis that seriously calls into question...... Read more »
Papaderos, P., & Östlin, G. (2012) I Zw 18 as morphological paradigm for rapidly assembling high- galaxies . Astronomy . DOI: 10.1051/0004-6361/201117551
Izotov, Y., Chaffee, F., Foltz, C., Thuan, T., Green, R., Papaderos, P., Fricke, K., & Guseva, N. (2001) A Spectroscopic Study of Component C and the Extended Emission around I Zw 18. The Astrophysical Journal, 560(1), 222-235. DOI: 10.1086/322494
Astronomers remain fascinated by gamma-ray bursts. These bursts of energy appear to be the most powerful explosions in the universe...... Read more »
Something unusual has been spotted lurking around several galaxies’ central black holes. Astronomers think it may be limiting the growth of the black holes – and stars elsewhere in the galaxies, too.
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Tombesi, F., Cappi, M., Reeves, J., & Braito, V. (2012) Evidence for ultrafast outflows in radio-quiet AGNs - III. Location and energetics. Monthly Notices of the Royal Astronomical Society: Letters. DOI: 10.1111/j.1745-3933.2012.01221.x
Nearly 13.7 billions years ago our universe consisted of three basic elements which included hydrogen, helium, and a little bit...... Read more »
Ian U. Roederer, James E. Lawler, John J. Cowan, Timothy C. Beers, Anna Frebel, Inese I. Ivans, Hendrik Schatz, Jennifer S. Sobeck, & Christopher Sneden. (2012) Detection of the Second r-process Peak Element Tellurium in Metal-Poor Stars. The Astrophysical Journal Letters, 747(1). DOI: arXiv:1202.2378
Simulations of galaxy formation based on the Lambda-Cold Dark Matter (ΛCDM) cosmological model predict that a large galaxy such as the Milky Way should have many dwarf satellite galaxies, perhaps thousands. However, only about 20 or 30 have been identified. Where are the rest? Are they really there? That question alludes to the “dwarf galaxy [...]... Read more »
Vegetti, S., Lagattuta, D., McKean, J., Auger, M., Fassnacht, C., & Koopmans, L. (2012) Gravitational detection of a low-mass dark satellite galaxy at cosmological distance. Nature, 481(7381), 341-343. DOI: 10.1038/nature10669
The U.S. Geological survey estimates that Earth experiences several million earthquakes and around 50 volcanic eruptions every year. But ours is...... Read more »
Martínez-Oliveros, J., Moradi, H., Besliu-Ionescu, D., Donea, A., Cally, P., & Lindsey, C. (2007) From Gigahertz to Millihertz: A Multiwavelength Study of the Acoustically Active 14 August 2004 M7.4 Solar Flare. Solar Physics, 245(1), 121-139. DOI: 10.1007/s11207-007-9004-8
A. Grigahcène, M.-A. Dupret, S. G. Sousa, M. J. P. F. G. Monteiro, R. Garrido, R. Scuflaire, & M. Gabriel. (2011) Towards precise asteroseismology of solar-like stars. Astrophysics and Space Science Proceedings series (ASSP). DOI: arXiv:1112.5961
Sibani, P., & Christiansen, S. (2008) Thermal shifts and intermittent linear response of aging systems. Physical Review E, 77(4). DOI: 10.1103/PhysRevE.77.041106
Sigh…another day, another research paper trying to convince the world that we are alone in the universe… I came across...... Read more »
Spiegel, D., & Turner, E. (2011) Bayesian analysis of the astrobiological implications of life's early emergence on Earth. Proceedings of the National Academy of Sciences, 109(2), 395-400. DOI: 10.1073/pnas.1111694108
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Rodriguez S, Le Mouélic S, Rannou P, Tobie G, Baines KH, Barnes JW, Griffith CA, Hirtzig M, Pitman KM, Sotin C.... (2009) Global circulation as the main source of cloud activity on Titan. Nature, 459(7247), 678-82. PMID: 19494910
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On February 5th, 2012, the Russian team has finally managed to penetrate through almost 4000 m (3,768 m) of Antarctica’s ice and reach the surface of lake Vostok.... Read more »
Bulat, S., Alekhina, I., Marie, D., Martins, J., & Petit, J. (2011) Searching for life in extreme environments relevant to Jovian’s Europa: Lessons from subglacial ice studies at Lake Vostok (East Antarctica). Advances in Space Research, 48(4), 697-701. DOI: 10.1016/j.asr.2010.11.024
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Berta, Z., Charbonneau, D., Désert, J., Miller-Ricci Kempton, E., McCullough, P., Burke, C., Fortney, J., Irwin, J., Nutzman, P., & Homeier, D. (2012) THE FLAT TRANSMISSION SPECTRUM OF THE SUPER-EARTH GJ1214b FROM WIDE FIELD CAMERA 3 ON THE HUBBLE SPACE TELESCOPE . The Astrophysical Journal, 747(1), 35. DOI: 10.1088/0004-637X/747/1/35
Scientific American recently published a cosmic timeline, beginning after the Big Bang and going to a time when sueprmassive black holes evaporate. This post is a primary-source investigation of the cosmic events cited in the timeline.... Read more »
Imagine an astronaut stepping out of a spacecraft onto the surface of an extrasolar planet that is capable of sustaining life. Now imagine the astronaut is greeted by the sight of red colored trees and grass. Such a scenario could be more reality than science fiction because of the variances in photosynthesis theorized to exist in other parts of the Milky Way Galaxy.... Read more »
Kiang, N., Siefert, J., Govindjee, ., & Blankenship, R. (2007) Spectral Signatures of Photosynthesis. I. Review of Earth Organisms. Astrobiology, 7(1), 222-251. DOI: 10.1089/ast.2006.0105
Kiang, N., Segura, A., Tinetti, G., Govindjee, ., Blankenship, R., Cohen, M., Siefert, J., Crisp, D., & Meadows, V. (2007) Spectral Signatures of Photosynthesis. II. Coevolution with Other Stars And The Atmosphere on Extrasolar Worlds. Astrobiology, 7(1), 252-274. DOI: 10.1089/ast.2006.0108
Judging by the many flares erupting from the sun at the moment, it is well on track to reach its next peak in activity early next year. As this peak approaches, we can expect many more huge bursts of energy that erupt from the sun and send lots of energetic particles, and sometimes magnetic fields, our way. These in turn will lead to more of the fantastic light displays, which you might have seen (or at least heard about) lately, creeping down from the North Pole towards the equator.... Read more »
Turner, D., Shprits, Y., Hartinger, M., & Angelopoulos, V. (2012) Explaining sudden losses of outer radiation belt electrons during geomagnetic storms. Nature Physics. DOI: 10.1038/nphys2185
The supermassive black holes (SMBHs) found in the centers of large galaxies can be astonishingly large. The closest example to us is in the giant elliptical galaxy M87, and it’s estimated to be 6.6 billion solar masses (M⊙). More distant examples can be even larger, more than 10 billion M⊙ (at distances ~300 million light-years). [...]... Read more »
Quite a bit of scientific literature on astrobiology is filled with references to very exacting criteria for exoplanets capable of sustaining alien ecosystems. They have to be just the right distance from their suns, have the right kind of atmosphere, fall in the right temperature range, and hopefully, have a large stabilizing moon to counter [...]... Read more »
This article first appeared in Guru Magazine.
Please listen carefully. There is life on Europa. I repeat: there is life on Europa…like huge strands of wet seaweed, crawling along the ground…Imagine an oak tree…flattened out by gravity…Tendrils, stamens, waving feebly…... Read more »
Kivelson MG, Khurana KK, Russell CT, Volwerk M, Walker RJ, & Zimmer C. (2000) Galileo Magnetometer Measurements: A Stronger Case for a Subsurface Ocean at Europa. Science (New York, N.Y.), 289(5483), 1340-3. PMID: 10958778
Schmidt BE, Blankenship DD, Patterson GW, & Schenk PM. (2011) Active formation of 'chaos terrain' over shallow subsurface water on Europa. Nature, 479(7374), 502-5. PMID: 22089135
Since it is currently, and for the foreseeable future, not possible to actually observe what the first stars in the universe were like when they formed, the only way to answer this question is by detailed calculations from first principles. In other words, by computer simulations. Until very recently, such simulations couldn’t be very conclusive, [...]... Read more »
Hosokawa, T., Omukai, K., Yoshida, N., & Yorke, H. (2011) Protostellar Feedback Halts the Growth of the First Stars in the Universe. Science, 334(6060), 1250-1253. DOI: 10.1126/science.1207433
An violent explosion appears to come from one of the most stunning astronomical objects in the sky. But what can a lab looking for one of Einstein's great predictions seeing nothing tell us about it?... Read more »
The LIGO Scientific Collaboration, J. Abadie, B. P. Abbott, T. D. Abbott, R. Abbott, M. Abernathy, C. Adams, R. Adhikari, C. Affeldt, P. Ajith.... (2012) Implications For The Origin Of GRB 051103 From LIGO Observations. Preprint. arXiv: 1201.4413v1
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