Gravitational lensing is a clean probe of the Universe and has much to tell us about its two most mysterious components – dark matter and dark energy. This article explains what it is, what is can discover and what Sherlock Holmes has to do with it.... Read more »
Kenneth C. Wong, Kim-Vy H. Tran, Sherry H. Suyu, Ivelina G. Momcheva, Gabriel B. Brammer, Mark Brodwin, Anthony H. Gonzalez, Aleksi Halkola, Glenn G. Kacprzak, Anton M. Koekemoer.... (2014) Discovery of a Strong Lensing Galaxy Embedded in a Cluster at z . The Astrophysical Journal Letters vol. 789 . arXiv: 1405.3661v2
Poor Voyager, he just can’t catch a break. We’ve said it’s hit interstellar space more times than we want to admit and in 2012, the Voyager mission team announced that […]... Read more »
G. Gloeckler, & L. A. Fisk. (2014) A test for whether or not Voyager 1 has crossed the heliopause. Geophysical Research Letters. info:/10.1002/2014GL060781
Black holes suck. Nothing can escape a black hole, not even light, which is why they are “black”. They are also an interesting bit of physics. Normally “classical” physics applies […]... Read more »
Zamaninasab, M., Clausen-Brown, E., Savolainen, T., & Tchekhovskoy, A. (2014) Dynamically important magnetic fields near accreting supermassive black holes. Nature, 510(7503), 126-128. DOI: 10.1038/nature13399
S. W. Hawking. (2014) Information Preservation and Weather Forecasting for Black Holes. Cornell University Library . arXiv: 1401.5761v1
Interest in atmospheres of outer planets took Jim Hansen from Iowa to NASA, where he came to realise that humans adding CO2 to Earth’s atmosphere would lead to an unprecedented warming, and brought that fact to the world’s attention.... Read more »
Matsushima, S., Zink, J., & Hansen, J. (1966) Atmospheric extinction by dust particles as determined from three-color photometry of the lunar eclipse of 19 December 1964. The Astronomical Journal, 103. DOI: 10.1086/109863
Hansen, J., & Matsushima, S. (1967) The Atmosphere and Surface Temperature of Venus: a Dust Insulation Model. The Astrophysical Journal, 1139. DOI: 10.1086/149410
Somerville, R.C.J., P.H. Stone, M. Halem, J.E. Hansen, J.S. Hogan, L.M. Druyan, G. Russell, A.A. Lacis, W.J. Quirk, and J. Tenenbaum. (1974) The GISS model of the global atmosphere. J. Atmos. Sci. DOI: 10.1007/BFb0019776
HANSEN, J., WANG, W., & LACIS, A. (1978) Mount Agung Eruption Provides Test of a Global Climatic Perturbation. Science, 199(4333), 1065-1068. DOI: 10.1126/science.199.4333.1065
Hansen, J., Johnson, D., Lacis, A., Lebedeff, S., Lee, P., Rind, D., & Russell, G. (1981) Climate Impact of Increasing Atmospheric Carbon Dioxide. Science, 213(4511), 957-966. DOI: 10.1126/science.213.4511.957
The galaxy known as M87 has a fastball that would be the envy of any baseball pitcher. It has thrown an entire star cluster toward us at more than two million miles per hour. The newly discovered cluster, which astronomers named HVGC-1, is now on a fast journey to nowhere. Its fate: to drift through the void between the galaxies for all time.
News release April 30, 2014 HARVARD-SMITHSONIAN CENTER FOR ASTROPHYSICS... Read more »
Nelson Caldwell, Jay Strader, Aaron J. Romanowsky, Jean P. Brodie, Ben Moore, Jurg Diemand, & Davide Martizzi. (2014) A Globular Cluster Toward M87 with a Radial Velocity . Cornell University Library. arXiv: 1402.6319v2
For the first time an international team of astronomers has measured circular polarisation in the bright flash of light from a dying star collapsing to a black hole, giving insight into an event that happened almost 11 billion years ago.
New insights into gamma-ray Burst afterglows-Niels Bohr Institute University of Copenhagen
Astronomers observe corkscrew nature of light from a distant black hole - Curtin University
Study of Gamma-Ray Bursts afterglow surprises scientists -University o........ Read more »
Wiersema, K., Covino, S., Toma, K., van der Horst, A., Varela, K., Min, M., Greiner, J., Starling, R., Tanvir, N., Wijers, R.... (2014) Circular polarization in the optical afterglow of GRB 121024A. Nature. DOI: 10.1038/nature13237
A new study from the University of Toronto Scarborough suggests the search for life on planets outside our solar system may be more difficult than previously thought.
The study, authored by a team of international researchers led by UTSC Assistant Professor Hanno Rein from the Department of Physical and Environmental Science, finds the method used to detect biosignatures on such planets, known as exoplanets, can produce a false positive result.
News release Apr 29, 2014 By Don Campbell Uni........ Read more »
Rein, H., Fujii, Y., & Spiegel, D. (2014) Some inconvenient truths about biosignatures involving two chemical species on Earth-like exoplanets. Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.1401816111
Kashiwa Japan – A team of researchers led by Robert Quimby at the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU) has announced the discovery of a galaxy that magnified a background, Type Ia supernova thirtyfold through gravitational lensing. This is the first example of strong gravitational lensing of a supernova confirms the team’s previous explanation for the unusual properties of this supernova.
News release April 25, 2014 Kavli Institute for ........ Read more »
Quimby, R., Oguri, M., More, A., More, S., Moriya, T., Werner, M., Tanaka, M., Folatelli, G., Bersten, M., Maeda, K.... (2014) Detection of the Gravitational Lens Magnifying a Type Ia Supernova. Science, 344(6182), 396-399. DOI: 10.1126/science.1250903
External Pulsed Plasma Propulsion (EPPP) is something that’s been discussed for some time. In fact, it was originally proposed by Stanislaw Ulam way back in 1947. Unfortunately the public perception of atomic technology as well as pieces of otherwise well meaning legislation have called into question the feasibility of spacecraft that operate using this advanced … Read More →... Read more »
J.A. Bonometti, & P. Jeff Morton. (2012) External pulsed plasma propulsion (EPPP) analysis maturation. 36th AIAA Joint Propulsion Conference. DOI: 10.2514/6.2000-3610
Video of magnetic field lines “slipping reconnection” bring scientists a step closer to predicting when and where large flares will occur.
Human civilisation is nowadays maintained by technology and that technology is vulnerable to space weather
Dr Jaroslav Dudik
News Release March 27, 2014 University of Cambridge... Read more »
Dudík, J., Janvier, M., Aulanier, G., Del Zanna, G., Karlický, M., Mason, H., & Schmieder, B. (2014) SLIPPING MAGNETIC RECONNECTION DURING AN X-CLASS SOLAR FLARE OBSERVED BY /AIA . The Astrophysical Journal, 784(2), 144. DOI: 10.1088/0004-637X/784/2/144
Astronomers have reported the chemical composition of two white dwarfs, G29-38 and GD 133, outside the solar system. Oxygen, magnesium, Silicon and Calcium are found in both planetesimals.
The Astrophysical Journal
It is a small, dim, extremely dense star that has collapsed on itself and is in the final stages of its evolution.
Elements in white dwarfs:
Calcium is the most easily noticed element and has been found in ........ Read more »
S. Xu (许偲艺), M. Jura, D. Koester, B. Klein, B. Zuckerman. (2014) Elemental compositions of two extrasolar rocky planetesimals. The Astrophysical Journal. DOI: 10.1088/0004-637X/783/2/79
Astronomers have found that only "strongly interacting" binary stars have the ability to end with powerful, bipolar jets of gas and dust.
Monthly Notices of the Royal Astronomical Society
Nebula refers to a region or cloud of interstellar dust and gas appearing variously as a hazy bright or dark patch. It is also called as nebulosity.
Supernova refers to a catastrophic explosion of a large star in the l........ Read more »
Eric G. Blackman, Scott Lucchini. (2014) Using kinematic properties of pre-planetary nebulae to constrain engine paradigms. Monthly Notices of the Royal Astronomical Society. DOI: 10.1093/mnrasl/slu001
Astronomers have reported the discovery of one of the most distant galaxies, dubbed Abell2744 Y1.
Astronomy and Astrophysics Letters
Redshift and previous findings:
Redshift refers to a shift in the spectrum of a celestial body toward longer wavelengths, or toward the red end of the spectrum, caused by its motion away from the Earth.
Previously, scientists reported a galaxy dubbed MACS1149-JD1 at a redshift of about 10, i.e. the galax........ Read more »
N. Laporte, A. Streblyanska, B. Clement, I. Pérez-Fournon, D. Schaerer, H. Atek, F. Boone, J.-P. Kneib, E. Egami, P. Martínez-Navajas, R. Marques-Chaves, R. Pelló, J. Richard. (2014) The first Frontier Fields cluster: 4.5mum excess in a z-8 galaxy candidate in Abell 2744 . Astronomy . DOI: 10.1051/0004-6361/201323179
NASA spacecraft revolving around and studying Mars have found the strongest indications of water flows on Mars while studying seasonal features.
Geophysical Research Letters
In a study by NASA’s Mars Opportunity Rover, it has been observed that water was present on Mars about four billion years ago that was probably supportive of life (DOI: 10.1126/science.1248097)
Now scientists have found some indications of water on Mars in cer........ Read more »
R. E. Arvidson et al. (2014) Ancient Aqueous Environments at Endeavour Crater, Mars. Science. DOI: 10.1126/science.1248097
Scientists have measured the mass of ghostly sub-atomic particles called neutrinos for the first time by using the observations of the Big Bang and the curvature of space-time.
Physical Review Letters
Cosmic Microwave Background:
Cosmic Microwave Background (CMB) can be referred to as the fading glow of the Big Bang, i.e. oldest light in the Universe.
Study of CMB helps scientists to study and measure accurately different cosmological........ Read more »
Richard A. Battye et al. (2014) Evidence for Massive Neutrinos from Cosmic Microwave Background and Lensing Observations. Physical Review Letters. DOI: 10.1103/PhysRevLett.112.051303
Some 30 years ago, astronomers found that regions of ionized gas around young high mass stars remain small (under a third of a light-year) for ten times longer than they should if they were to expand as expected in simple models. Recent supercomputer simulations predicted that these regions actually flicker in brightness over this period … Read More →... Read more »
C. G. De Pree, T. Peters, M.-M. Mac Low, D. J. Wilner, W. M. Goss, R. Galván-Madrid, E. R. Keto, R. S. Klessen, & A. Monsrud. (2014) Flickering of 1.3 cm Sources in Sgr B2: Toward a Solution to the Ultracompact H II Region Lifetime Problem. The Astrophysical Journal Letters, 781(L36). DOI: 10.1088/2041-8205/781/2/L36
Astronomer has seen the river of hydrogen flowing through space with the help of NSF's Robert C. Byrd Green Bank Telescope (GBT).
The Astronomical Journal
The data presented by GBT is showing that the shining hydrogen is present between the larger galaxy and its smaller companions. Hydrogen can be seen in the image in the form of dense hydrogen in orange color and the extremely diffuse and extended field of hydrogen in red color. In th........ Read more »
D. J. Pisano. (2014) Green Bank Telescope observations of low column density HI around NGC 2997 and NGC 6946. The Astronomical Journal. DOI: 10.1088/0004-6256/147/3/48
Astronomers have found Kepler-410Ab that is a Neptune-sized planet outside of our solar system in a binary star system.
The Astrophysical Journal
Kepler-410Ab is found to be rotating around a star present in a binary system named Kepler-410 that is also known as HD 175289 or KOI-42. This system has a fast-rotating planet host star, Kepler-410A, and a fainter companion, Kepler-410B, and is present in the constellation Lyra about 431 light-ye........ Read more »
V. Van Eylen et al. (2014) What asteroseismology can do for exoplanets: Kepler-410A b is a Small Neptune around a bright star, in an eccentric orbit consistent with low obliquity. The Astrophysical Journal. DOI: 10.1088/0004-637X/782/1/14
Astronomers have found a gas cloud in the Universe that is the largest known to humanity. It is about 2 million light years across and reveals “cosmic web”.
Astronomers utilize the 10-m Keck I Telescope at the W. M. Keck Observatory in Hawaii and found the remote shining quasar UM 287 that shed light on the nearby gas cloud that is the largest known gas cloud, i.e. nebula, in the Universe. It is of about 460,000 parsecs ........ Read more »
Sebastiano Cantalupo et al. (2014) A cosmic web filament revealed in Lyman-α emission around a luminous high-redshift quasar. Nature. DOI: 10.1038/nature12898
Research on first data release from Gaia-ESO project suggests the Milky Way formed by expanding out from the centre, and reveals new insights into the way our Galaxy was assembled.
20 Jan 2014 University of Cambridge
We have been able to shed new light on the timescale of chemical enrichment across the Milky Way disc, showing that outer regions of the disc take a much longer time to form
Maria Bergemann... Read more »
M. Bergemann, et. al. (2014) The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk. Cornell University Library. DOI: arXiv:1401.4437v1
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