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
Astronomers have discovered a distant quasar illuminating a vast nebula of diffuse gas, revealing for the first time part of the network of filaments thought to connect galaxies in a cosmic web.
Further reading... Read more »
Sebastiano Cantalupo, Fabrizio Arrigoni-Battaia, J. Xavier Prochaska, Joseph F. Hennawi, & Piero Madau. (2014) A cosmic web filament revealed in Lyman-α emission around a luminous high-redshift quasar . Nature. DOI: 10.1038/nature12898
Jörg P. Dietrich, Norbert Werner, Douglas Clowe, Alexis Finoguenov, Tom Kitching, Lance Miller, & Aurora Simionescu. (2012) A filament of dark matter between two clusters of galaxies. Nature. DOI: 10.1038/nature11224
Moon is the only natural satellite of Earth. People want to read about different facts about the moon and you probably have also come after searching.
We want to read about the facts but space agencies are working on the facts. Major space agencies of the world including NASA, ESO and the China National Space Administration are considering sending first manned missions to the satellite by the year 2020. India and Japan are also showing interests to send missions by that time.
Here, I have ........ Read more »
Christian Cajochen, Songül Altanay-Ekici, Mirjam Münch, Sylvia Frey, Vera Knoblauch, Anna Wirz-Justice. (2013) Evidence that the Lunar Cycle Influences Human Sleep. Current Biology. DOI: 10.1016/j.cub.2013.06.029
J. H. Shuhaiber, J. L. Fava, T. Shin, N. Dobrilovic, A. Ehsan, A. Bert, F. Sellke. (2013) The influence of seasons and lunar cycle on hospital outcomes following ascending aortic dissection repair. Interactive CardioVascular and Thoracic Surgery. DOI: 10.1093/icvts/ivt299
Scientists have found a planet about 2,500 light years away in the star cluster Messier 67. This planet has been discovered by using European Southern Observatory Harps planet hunter in Chile.
Astronomy & Astrophysics
This planet is present in the constellation Cancer (The Crab) having about 500 stars. This cluster Messier 67 is about 4 billion years old, i.e. almost of the same age as that of Earth and Sun.
This planet in space is of s........ Read more »
Astronomers have found a new giant planet, HD 4203c, outside of our solar system rotating around a neighboring G5 star HD 4203.
HD 4203c is rotating around its star in a time of 18.2 years of Earth. This planet is found to be of mass of about 2.17 times that of Jupiter. HD 4203 is located about 250 light years away from us in the constellation Pisces.
This star system is same as the other three systems with extrasolar planets, HD 1........ Read more »
Stephen R. Kane, Steve B. Howell, Elliott P. Horch, Ying Feng, Natalie R. Hinkel, David R. Ciardi, Mark E. Everett, Andrew W. Howard, & Jason T. Wright. (2014) Limits on Stellar Companions to Exoplanet Host Stars With Eccentric Planets. arXiv. arXiv: 1401.1544v1
Scientists have found a new class of stars in universe, dubbed as "hypervelocity stars" moving with such a high speed that they are out of gravitational grip of the Milky Way galaxy.
Our universe is full of stars and usually, the stars come from the center of our galaxy. However, these new types of stars are not found to come from the center of our galaxy.
“These new hypervelocity stars are very diff........ Read more »
Lauren E. Palladino et al. (2014) HYPERVELOCITY STAR CANDIDATES IN THE SEGUE G AND K DWARF SAMPLE. The Astrophysical Journal. DOI: 10.1088/0004-637X/780/1/7
Scientists have reported that “super-Earths” in our galaxy have more chances of having climate similar to Earth. These chances are more than our previous expectations.
Before this research, it was commonly thought that super-Earths are unlike Earth. However, after this research, we know that super-Earths would be “waterworlds” having most of the water in the mantle - the part of the Earth or anot........ Read more »
Nicolas B. Cowan et al. (2014) Water Cycling Between Ocean and Mantle: Super-Earths Need Not Be Waterworlds. Astrophysical Journal. DOI: 10.1088/0004-637X/781/1/27
The Baryon Oscillation Spectroscopic Survey makes the most precise calibration yet of the universe’s “standard ruler”
Further reading and links at TK's page... Read more »
Lauren Anderson et al. (2013) The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 10 and 11 galaxy samples. Cornell University Library. DOI: arXiv:1312.4877v1
Kyle S. Dawson, et al. (2012) The Baryon Oscillation Spectroscopic Survey of SDSS-III. Cornell University Library. DOI: arXiv:1208.0022v3
Hubert L. Bray. (2012) On Wave Dark Matter, Shells in Elliptical Galaxies, and the Axioms of General Relativity. Cornell University Library. DOI: arXiv:1212.5745v1
Scientists have presented new study that is supporting one of the theories about the formation of binary-stars.
The Astrophysical Journal
Binary star is a pair of stars that revolve around their common center of mass under mutual gravitational attraction. Nearly half of all Sun-like stars comprise double or multiple-star systems but the mechanism behind the formation of such systems was not clear.
"The only way to resolve the debate........ Read more »
John J. Tobin et al. (2013) VLA and CARMA Observations of Protostars in the Cepheus Clouds: Sub-arcsecond Proto-binaries Formed via Disk Fragmentation. The Astrophysical Journal. DOI: 10.1088/0004-637X/779/2/93
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