Astronomy posts
- April 22, 2013
- 12:43 PM
- 69 views
Using Black Holes to Measure the Universe’s Rate of Expansion
by Jason Carr in Wired Cosmos
A few years ago, researchers revealed that the universe is expanding at a much faster rate than originally believed — a discovery that earned a Nobel Prize in 2011. But measuring the rate of this acceleration over large distances is still challenging and problematic, says Prof. Hagai Netzer of Tel Aviv University’s School of Physics and Astronomy. Now, Prof. … Read More →... Read more »
Wang, J., Du, P., Valls-Gabaud, D., Hu, C., & Netzer, H. (2013) Super-Eddington Accreting Massive Black Holes as Long-Lived Cosmological Standards. Physical Review Letters, 110(8). DOI: 10.1103/PhysRevLett.110.081301
- April 21, 2013
- 10:18 PM
- 121 views
Gravity doesn’t actually exist; A new theory
by Usman Paracha in SayPeople
Main point:
According to the new theory, Gravity is not the fundamental force or fundamental interaction but it is actually the result of the laws of thermodynamics, which tells us about the behavior of heat and gases.
Journal:
Journal of High Energy Physics
Study Further:
The New York Times reported on July 12, 2010 that Professor Erik Verlinde, 48, a respected string theorist and professor of physics at the University of Amsterdam, said in the paper, submitted on January 6th, ........ Read more »
Verlinde, E. (2011) On the origin of gravity and the laws of Newton. Journal of High Energy Physics, 2011(4). DOI: 10.1007/JHEP04(2011)029
- April 17, 2013
- 02:07 PM
- 89 views
Star factory in the early Universe challenges galaxy evolution theory
by Perikis Livas in Tracing Knowledge
ESA’s Herschel space observatory has discovered an extremely distant galaxy making stars more than 2000 times faster than our own Milky Way. Seen at a time when the Universe was less than a billion years old, its mere existence challenges our theories of galaxy evolution.... Read more »
Markus Bauer. (2013) Star factory in the early Universe challenges galaxy evolution theory. ESA Herschel. info:/
- April 17, 2013
- 11:21 AM
- 68 views
Most productive findings about galaxies in very less time utilizing Ultra-sharp ALMA telescope
by Usman Paracha in SayPeople
ALMA helped astronomers to study the galaxies clearly (Credit: ALMA (ESO/NAOJ/NRAO), APEX (MPIfR/ESO/OSO), J. Hodge et al., A. Weiss et al., NASA Spitzer Science Center)
Main point:
Researchers have presented the most productive findings of the star-forming galaxies of the early universe taken with the help of Atacama Large Millimeter / submillimeter Array (ALMA) in Chile in very less time than the conventional telescopes.
Journal:
Astrophysical Journal
Study Further:
You can i........ Read more »
J. A. Hodge, A. Karim, I. Smail, A. M. Swinbank, F. Walter, A. D. Biggs, R. J. Ivison, A. Weiss, D. M. Alexander, F. Bertoldi.... (2013) An ALMA survey of submillimeter galaxies in the Extended Chandra Deep Field South: Source catalog and multiplicity. Astrophysical Journal. arXiv: 1304.4266v1
- April 17, 2013
- 05:03 AM
- 70 views
At the Mercy and Fury of Our Parent Star
by Zach Urbina in United Academics
Nearly every organism that’s ever lived and died (certainly every person you’ve ever met) owes their continued existence to the steady flow of charged, particulate energy that originates from the thermonuclear fusion of our star. It is the most perfectly spherical object ever observed in nature. The Earth, by comparison is lumpy and bulging, not a sphere, but an oblate spheroid (flat at its poles, bulbous around its equatorial regions). Once thought of as average and relatively banal........ Read more »
Kuhn, J., Bush, R., Emilio, M., & Scholl, I. (2012) The Precise Solar Shape and Its Variability. Science, 337(6102), 1638-1640. DOI: 10.1126/science.1223231
Charles J. Lada. (2006) Stellar Multiplicity and the IMF: Most Stars Are Single. Astrophys.J. 640 (2006) L63-L66. arXiv: astro-ph/0601375v2
- April 16, 2013
- 12:19 PM
- 66 views
Front Row at the Dawn of Time
by Perikis Livas in Tracing Knowledge
As long as humans have been human, we have been fascinated by cosmic questions. How did the universe begin? Where did we come from? Are we alone? Attempting to answer these questions may not produce a better toaster or a faster airplane, but it is nothing short of remarkable that modern science is revealing facets of our universe that are changing our perspectives on such foundational cosmic questions.... Read more »
LAWRENCE M. KRAUSS. (2013) Front Row at the Dawn of Time. The International Herald Tribune. info:/
- April 6, 2013
- 04:56 AM
- 129 views
Gravity-Bending Find Leads to Kepler Meeting Einstein
by Perikis Livas in Tracing Knowledge
NASA’s Kepler space telescope has witnessed the effects of a dead star bending the light of its companion star. The findings are among the first detections of this phenomenon — a result of Einstein’s general theory of relativity — in binary, or double, star systems.... Read more »
Whitney Clavin. (2013) Gravity-Bending Find Leads to Kepler Meeting Einstein. NASA Jet Propulsion Laboratory, Caltech. info:/
- April 5, 2013
- 11:26 AM
- 129 views
White dwarf bends the light coming from the companion red dwarf
by Usman Paracha in SayPeople
Artist depiction of the white dwarf with the red star (Credit: NASA/JPL-Caltech)
Main point:
Researchers found that the dead star, also called as the white dwarf, changed the path of the light of the companion red star.
Journal:
Astrophysical Journal
Study Further:
This discovery is among the first findings of this bending of light that was initially predicted by Einstein's theory of general relativity in binary star systems. Researchers used Cornell-led ultraviolet measur........ Read more »
Muirhead, P., Vanderburg, A., Shporer, A., Becker, J., Swift, J., Lloyd, J., Fuller, J., Zhao, M., Hinkley, S., Pineda, J.... (2013) CHARACTERIZING THE COOL KOIs. V. KOI-256: A MUTUALLY ECLIPSING POST-COMMON ENVELOPE BINARY. The Astrophysical Journal, 767(2), 111. DOI: 10.1088/0004-637X/767/2/111
- April 4, 2013
- 12:49 PM
- 145 views
Astrophysics: Fire in the hole!
by Perikis Livas in Tracing Knowledge
In March 2012, Joseph Polchinski began to contemplate suicide — at least in mathematical form. A string theorist at the Kavli Institute for Theoretical Physics in Santa Barbara, California, Polchinski was pondering what would happen to an astronaut who dived into a black hole. Obviously, he would die. But how?... Read more »
Merali, Z. (2013) Astrophysics: Fire in the hole!. Nature, 496(7443), 20-23. DOI: 10.1038/496020a
- April 4, 2013
- 10:04 AM
- 112 views
Cosmic ray detector confirms hints of dark matter
by Perikis Livas in Tracing Knowledge
This first batch of AMS results, published April 3 in Physical Review Letters, encompasses about 25 billion particles detected over the course of a year and a half, including 6.8 million measurements of the electrons and positrons that could come from dark matter. AMS improved the precision of earlier data, detected particles at higher energies than previous instruments and found that the particles arrive in equal amounts from all directions.... Read more »
Andrew Grant. (2013) Cosmic ray detector confirms hints of dark matter. ScienceNews. info:/
- April 4, 2013
- 08:27 AM
- 120 views
Stars in NGC 602a
by Perikis Livas in Tracing Knowledge
The Small Magellanic Cloud (SMC) is one of the Milky Way’s closest galactic neighbors. Even though it is a small, or so-called dwarf galaxy, the SMC is so bright that it is visible to the unaided eye from the Southern Hemisphere and near the equator. Many navigators, including Ferdinand Magellan who lends his name to the SMC, used it to help find their way across the oceans.
Modern astronomers are also interested in studying the SMC (and its cousin, the Large Magellanic Cloud), but for ........ Read more »
J.D. Harrington, Janet Anderson, & Megan Watzke. (2013) Stars in NGC 602a. NASA News. info:/
- April 2, 2013
- 01:34 AM
- 120 views
Studying supernova 1987A remnant at millimeter wavelengths
by Usman Paracha in SayPeople
Main point:
Astronomers have taken the highest resolution radio images of the expanding supernova 1987A remnant at millimeter wavelengths with the help of Australia Telescope Compact Array, CSIRO radio telescope in northern New South Wales.
Journal:
Astrophysical Journal
Study Further:
"Imaging distant astronomical objects like this at wavelengths less than 1 centimetre demands the most stable atmospheric conditions. For this telescope these are usually only possible during c........ Read more »
Giovanna Zanardo, L. Staveley-Smith, C. -Y. Ng, B. M. Gaensler, T. M. Potter, R. N. Manchester, & A. K. Tzioumis. (2013) High-resolution radio observations of SNR 1987A at high frequencies. Astrophysical Journal. arXiv: 1301.6527v1
- April 1, 2013
- 01:23 PM
- 126 views
Scorpion-like Life Discovered on Surface of Venus
by Paul Wren in Venus Dispatches
In a recent paper published in Solar System Research (Ksanfomality, 2012), revered senior statesman of Russian planetary science Leonid Ksanfomality reported the detection of possible life forms on Venus.Using modern image enhancement techniques to re-analyze the panoramic images captured by Veneras 9 and 13 (in 1975 and 1982, respectively), Ksanfomality discovered objects that he observed moving, "Scorpion" appeared in image V-13-1-6 BW at the90th minute after landing of Venera 13. I........ Read more »
Ksanfomality, L. (2012) Venus as a natural laboratory for search of life in high temperature conditions: Events on the planet on March 1, 1982. Solar System Research, 46(1), 41-53. DOI: 10.1134/S0038094612010042
- March 23, 2013
- 03:40 AM
- 170 views
Planck reveals new insight into universe
by Perikis Livas in Tracing Knowledge
This morning, scientists on the Planck space mission released the most detailed map yet of the afterglow of the big bang. It reveals that our universe is about 100 million years older, is expanding slower and contains less dark energy and more matter—both normal and dark—than previously thought.... Read more »
Kelen Tuttle. (2013) Planck reveals new insight into universe. Symmetry Magazine. info:/
- March 16, 2013
- 11:14 AM
- 138 views
HR 8799c – an exoplanet – has water and carbon monoxide in its atmosphere
by Usman Paracha in SayPeople
Main Point:
Scientists have found water vapor and carbon monoxide in the atmosphere of a Jupiter-size extrasolar planet, dubbed as HR 8799c orbiting a star known as HR 8799.
Journal:
Science
Artist's depiction of the planetary system of HR 8799 with HR 8799c and disk of gas and dust (Credit: Dunlap Institute for Astronomy & Astrophysics; Mediafarm)
Study Further:
HR 8799c is a gas-giant and has about seven times the mass of Jupiter. This planet is rotating around its ........ Read more »
Konopacky, Q., Barman, T., Macintosh, B., & Marois, C. (2013) Detection of Carbon Monoxide and Water Absorption Lines in an Exoplanet Atmosphere. Science. DOI: 10.1126/science.1232003
- March 15, 2013
- 03:20 PM
- 148 views
Passive Radio Ice Depth Experiment
by Olga Vovk in Milchstraße
I would like to discuss one method used for estimate thickness of Antarctic ice, which could be easily adopted for space exploration and could be used to estimate the thickness of ice mantle on extraterrestrial planets, on Ceres and other bodies in the main asteroid belt, and on Jovian moons.... Read more »
Miller, T., Schaefer, R., & Brian Sequeira, H. (2012) PRIDE (Passive Radio [frequency] Ice Depth Experiment): An instrument to passively measure ice depth from a Europan orbiter using neutrinos. Icarus, 220(2), 877-888. DOI: 10.1016/j.icarus.2012.05.028
- March 14, 2013
- 09:57 AM
- 167 views
The Benefits of Current Mars Research
by Jason Carr in Wired Cosmos
Martian exploration is unquestionably a hot topic right now. Mainstream media outlets have largely focused on the most visible efforts of the Curiosity mission, and that’s a good thing. While people might be thrilled with the photographs that they have an opportunity to view on their screens however, they may be less familiar with the [...]... Read more »
Peters, G., Smith, J., Mungas, G., Bearman, G., Shiraishi, L., & Beegle, L. (2008) RASP-based sample acquisition of analogue Martian permafrost samples: Implications for NASA's Phoenix scout mission. Planetary and Space Science, 56(3-4), 303-309. DOI: 10.1016/j.pss.2007.10.001
Amato P, Doyle SM, Battista JR, & Christner BC. (2010) Implications of subzero metabolic activity on long-term microbial survival in terrestrial and extraterrestrial permafrost. Astrobiology, 10(8), 789-98. PMID: 21087159
- March 13, 2013
- 11:07 AM
- 163 views
Pluto may have a number of hidden moons
by Usman Paracha in SayPeople
Predicted system configuration for the Pluto–Charon system (Credit: Kenyon)
Main Points: Pluto may have 10 or more moons that are still undiscovered according to the new simulations. These undiscovered moons would pose some problems to the planned flyby of the spacecraft in 2015.
Journal: The Astronomical Journal
Study Further:
Team behind the NASA’s New Horizons mission planned to take close-ups of the Pluto system in July 2015 but this new finding could cause the team t........ Read more »
Scott J. Kenyon, & Benjamin C. Bromley. (2013) The Formation of Pluto's Low Mass Satellites. The Astronomical Journal. arXiv: 1303.0280v1
- March 12, 2013
- 12:49 PM
- 204 views
Mini Black Holes on Earth could be formed more easily than thought
by Usman Paracha in SayPeople
Snapshot from the video showing two particles colliding and forming black holes (Credit: Matt Choptuik, Will East, Frans Pretorius)
Main Points: Scientists have reported that less energy is required than previous estimations in the development of mini black holes utilizing particle accelerators on Earth. Moreover, the development of such black holes with such energies could prove the presence of higher dimensions in the universe.
Journal: Physical Review Letters
Study Further:
On lar........ Read more »
East, W., & Pretorius, F. (2013) Ultrarelativistic Black Hole Formation. Physical Review Letters, 110(10). DOI: 10.1103/PhysRevLett.110.101101
- March 12, 2013
- 11:36 AM
- 187 views
Top scientific breakthrough opens door to understanding universe
by Perikis Livas in Tracing Knowledge
BLACKSBURG, Va., March 11, 2013 – Physicists at Virginia Tech, as part of a collaboration with U.S. and Chinese researchers, took part in one of 2012’s top scientific breakthroughs according to Science Magazine. It’s a breakthrough that could have a significant impact on physics and the universe as we understand it.... Read more »
Rosaire Bushey. (2013) Top scientific breakthrough opens door to understanding universe. Virginia Tech News. info:/
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