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Astronomy posts

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  • January 10, 2014
  • 08:32 AM
  • 840 views

“Super-Earths are habitable” and could have Earth-like climate

by Usman Paracha in SayPeople

Main Points:

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.
Published in:

Astrophysical Journal

Study Further:

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 »

  • January 8, 2014
  • 05:05 PM
  • 1,123 views

BOSS Measures the Universe to One-Percent Accuracy

by Perikis Livas in Chilon

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 »

  • January 2, 2014
  • 10:40 AM
  • 844 views

New discovery supports an old idea of binary-star formation

by Usman Paracha in SayPeople

Main Point:

Scientists have presented new study that is supporting one of the theories about the formation of binary-stars.

Published in:

The Astrophysical Journal

Study Further:

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 »

  • January 2, 2014
  • 10:03 AM
  • 826 views

Cloudy planets found with Hubble telescope of NASA

by Usman Paracha in SayPeople

Main Points:

Astronomers have found “cloudy Super-Worlds” with the help of NASA's Hubble. They are of opinion that there could be more clouds around there.

Published in:

Nature

Study Further:

Astronomers studied these planets, namely GJ 436b and GJ 1214b, in our Milky Way with the help of NASA's Hubble space telescope. They found layers of clouds on these planets inhibiting further research about the atmospheres of the planets.

GJ 436b is present about 36 ........ Read more »

  • December 27, 2013
  • 01:38 AM
  • 774 views

Most energetic form of light-bursts in space has two forms

by Usman Paracha in SayPeople

Main Points:

Scientists have found a new type of gamma-ray burst (GRB) called radio faint GRB that is unlike usual GRBs due to differences in the magnetic field of the exploding star.

Published in:

The Astrophysical Journal

Study Further:

Gamma-ray burst (GRB):

GRBs are bright flashes of gamma rays - the most energetic form of light - that are found with the explosions of huge stars in remote galaxies.

Present Study:

Astronomers thought that all GRBs are followed by a str........ Read more »

Paul J Hancock, Bryan M Gaensler, & Tara Murphy. (2013) Two populations of gamma-ray burst radio afterglows. arXiv. arXiv: 1308.4766v2

  • December 24, 2013
  • 09:35 AM
  • 726 views

First ever probable discovery of moon out of the solar system

by Usman Paracha in SayPeople

Main Point:

Astronomers have probably found the first exomoon located about 1800 light years away from us.

Published in:

arXiv

Study Further:

Exomoon:

An exoplanet is the planet that is rotating a star outside of our solar system. Similarly, exomoon is the moon that orbits a planet outside of our solar system.

Microlensing:

When an object moves in front of a remote star from Earth, the object's gravity bends the light coming from the star in the background, presentin........ Read more »

D. P. Bennett, V. Batista, I. A. Bond, C. S. Bennett, D. Suzuki, J. -P. Beaulieu, A. Udalski, J. Donatowicz, F. Abe, C. S. Botzler.... (2013) A Sub-Earth-Mass Moon Orbiting a Gas Giant Primary or a High Velocity Planetary System in the Galactic Bulge. arXiv. arXiv: 1312.3951v1

  • December 19, 2013
  • 10:35 AM
  • 673 views

New discovery of very bright and most distant supernovae

by Usman Paracha in SayPeople

Main Point:

Astronomers have found two “dinosaurs of supernovae”, i.e. super luminous supernovae, while working for the Supernova Legacy Survey (SNLS) in 2006 and 2007.

Published in:

The Astrophysical Journal

Study Further:

Initially, the supernovae were so atypical that astronomers were unable to understand what they were or their distances from Earth. Then the supernovae were found to be the brightest, i.e. 100 times more bright than an ordinary supernova, and most d........ Read more »

  • December 18, 2013
  • 08:03 AM
  • 692 views

First-ever clear view of W49A in our galaxy

by Usman Paracha in SayPeople

Main Point:

Astronomers got a first-ever clear view of a giant star cluster formation in W49A region located on the opposite side of our galaxy.

Published in:

The Astrophysical Journal

Study Further:

In the present study, U.S. astronomers used the Smithsonian's Submillimeter Array (SMA) to uncover a huge star-forming region known as W49A that is located about 36,000 light-years away from us on the opposite side of the Milky Way galaxy. Although, W49A is nearly 100 times brigh........ Read more »

  • December 17, 2013
  • 06:36 PM
  • 700 views

4 spiral arms are reassured for our galaxy

by Usman Paracha in SayPeople

Main Points:

Scientists have finally confirmed that our Milky Way galaxy has four spiral arms. This confirmation has been done after a study of massive stars in the Milky Way for about 12-years.

Published in:

Monthly Notices of the Royal Astronomical Society

Study Further:

We live in Milky Way galaxy and that is the reason, we cannot look at its shape from outside - at last not at this time, perhaps in the future we may be able to see - so, the scientists devised a way to deduce i........ Read more »

  • December 17, 2013
  • 09:09 AM
  • 646 views

Possibility of a planet in a nearest system of failed stars

by Usman Paracha in SayPeople

Main Point:

Astronomers have noted a planet-like object in a system of failed stars that is closest to the Sun.

Published in:

arXiv - Astronomy & Astrophysics Letter in Press

Study Further:

Brown Dwarf:

Brown dwarf is a star that is smaller than a planet and has a mass equivalent to less than one-tenth of the Sun’s mass. Such stars are not able to burn hydrogen in their centers.

Luhman 16AB:

Luhman 16AB is the system of two brown dwarfs located about 6.6 light-years........ Read more »

  • December 16, 2013
  • 04:29 AM
  • 783 views

End of Universe due to collapse is perhaps closer than we think

by Usman Paracha in SayPeople

Main Point:

Scientists have noted that perhaps our universe is either very close to collapse or it has already started collapsing bringing it closer to its end.

Published in:

Journal of High Energy Physics

Study Further:

Astronomy initially showed that our universe expanded after its coming into being and they are of the opinion that after a limit of expansion, it will start to collapse but we are not sure whether this collapse will happen and if it will happen, when it will happe........ Read more »

  • December 11, 2013
  • 08:36 AM
  • 699 views

New project to remove conflict among galaxy simulations

by Usman Paracha in SayPeople

Main Point:

In a new project dubbed AGORA, researchers are working to remove the discrepancies among different computer models of galaxy formation by comparing different codes against each other.

Published in:

arXiv

Study Further:

The project AGORA is the short form for Assembling Galaxies of Resolved Anatomy. “We investigate galaxy formation with high-resolution numerical simulations and compare the results across different platforms, and with observation,” Project AG........ Read more »

Ji-hoon Kim, Tom Abel, Oscar Agertz, Greg L. Bryan, Daniel Ceverino, Charlotte Christensen, Charlie Conroy, Avishai Dekel, Nickolay Y. Gnedin, Nathan J. Goldbaum.... (2013) The AGORA High-Resolution Galaxy Simulations Comparison Project. arXiv. arXiv: 1308.2669v4

  • December 10, 2013
  • 09:42 AM
  • 770 views

Largest known crater of solar system could help in Moon’s study

by Usman Paracha in SayPeople

Main Points:

One of the largest known craters in the solar system on Moon, i.e. 2,500 mile crater that was formed by a huge impact about 4 billion years ago could help scientists in studying the Moon’s lower crust and mantle.

Published in:

Journal of Geophysical Research: Planets

Study Further:

Crater:

Crater refers to a bowl-shaped hole on the surface of the Moon or a planet caused by the impact of a meteorite. You can also say that it is a large hole in the ground or a ........ Read more »

  • December 9, 2013
  • 09:55 AM
  • 679 views

In astronomy, usually “the more we know, the more we know that we don't know”

by Usman Paracha in SayPeople

Main Points:

Astronomers have found that stars in the very beginning of universe used very little dust. This finding has enhanced the mysteriousness of the formation of very early stars.

Published in:

Nature

Study Further:

Very little dust in the early universe:

Our present knowledge shows that a huge amount of dust and gas is required to make stars and galaxies but this recent study has opposed our present knowledge. This study is presenting very little dust in the early unive........ Read more »

  • December 8, 2013
  • 11:03 AM
  • 1,478 views

Neutron stars’ X-ray superbursts …

by Perikis Livas in Chilon

… mystify, inspire Los Alamos scientists

Massive X-ray superbursts near the surface of neutron stars are providing a unique window into the operation of fundamental forces of nature under extreme conditions.... Read more »

Schatz H, Gupta S, Möller P, Beard M, Brown EF, Deibel AT, Gasques LR, Hix WR, Keek L, Lau R.... (2013) Strong neutrino cooling by cycles of electron capture and β- decay in neutron star crusts. Nature. PMID: 24291788  

  • December 6, 2013
  • 01:57 AM
  • 615 views

New finding of metal-rich extremely low mass white dwarf

by Usman Paracha in SayPeople

This illustration shows gas pulled from a companion star into a disk around by a white dwarf star, where it's funneled down to the dwarf's surface. (Credit: NASA/CXC/M. Weiss)
Illustration to show gas pulled from a companion star into a disk around by a white dwarf star, where it's funneled down to the dwarf's surface. (Credit: NASA/CXC/M. Weiss)
Main Point:

Scientists have reported an unusual, tidally-distorted extremely low mass white dwarf having almost the same amoun........ Read more »

A. Gianninas, J. J. Hermes, Warren R. Brown, P. Dufour, Sara D. Barber, Mukremin Kilic, Scott J. Kenyon, & Samuel T. Harrold. (2013) SDSS J074511.56 194926.5: Discovery of a Metal-Rich and Tidally Distorted Extremely Low Mass White Dwarf. arXiv. arXiv: 1312.1665v1

  • December 4, 2013
  • 05:02 AM
  • 629 views

Young star with explosive growth in our Milky Way galaxy

by Usman Paracha in SayPeople

Main Point:

Scientists have reported the explosive growth of a young star that is thought to be formed within the past 100,000 years in our Milky Way galaxy.

Published in:

Astrophysical Journal Letters

Study Further:

Astronomers used the large international telescope, the Atacama Large Millimeter Array (ALMA) in northern Chile, and studied the star and its surroundings. They studied a young, newly created star in the Milky Way that has such an explosive growth that it was about 10........ Read more »

Jes K. Jorgensen, Ruud Visser, Nami Sakai, Edwin A. Bergin, Christian Brinch, Daniel Harsono, Johan E. Lindberg, Ewine F. van Dishoeck, Satoshi Yamamoto, Suzanne E. Bisschop.... (2013) A recent accretion burst in the low-mass protostar IRAS 15398-3359: ALMA imaging of its related chemistry. arXiv. arXiv: 1312.0724v1

  • December 2, 2013
  • 03:00 PM
  • 819 views

How the Milky Way feeds itself to make new stars

by Jeffrey Daniels in United Academics

Galaxies like our Milky Way make stars. In order to accomplish that, the galaxy must first have clouds of hydrogen and helium. But gas clouds floating in from intergalactic space are usually deflected by the galaxy’s electromagnetic field.... Read more »

Alex S. Hill, S. A. Mao, Robert A. Benjamin, Felix J. Lockman, & Naomi M. McClure-Griffiths. (2013) Magnetized Gas in the Smith High Velocity Cloud. 2013, ApJ, 777, 55. arXiv: 1309.2553v2

  • December 2, 2013
  • 01:53 AM
  • 751 views

The more we studied neutron star, the more study it needs

by Usman Paracha in SayPeople

Main Point:

Scientists have theoretically found previously unknown layers on stars that enhance the mystery of the mechanism through which neutron stars heat up.

Published in:

Nature

Study Further:

Neutron Star:

In astronomy, neutron star is a star composed of neutrons. It is a celestial body consisting entirely of a very dense compact mass of neutrons, the remnant of a star that has collapsed under its own gravity.

Neutrino:

It is a neutral elementary particle. Technical........ Read more »

  • November 30, 2013
  • 12:03 PM
  • 658 views

New report of oldest known brown dwarfs in our galaxy

by Usman Paracha in SayPeople

Main Point:

Astronomers have reported two of the newly discovered yet oldest known brown dwarfs in our Milky Way Galaxy moving at speeds of 100-200 km/sec.

Published in:

arXiv, accepted for publication in Monthly Notices of the Royal Astronomical Society (MNRAS)

Study Further:

Brown Dwarf:

It is a star-like object that is smaller than a planet and has a mass equivalent to less than one-tenth of the Sun’s mass. Brown dwarfs are unable to produce internal heat through nucle........ Read more »

D. J. Pinfield, J. Gomes, A. C. Day-Jones, S. K. Leggett, M. Gromadzki, B. Burningham, M. T. Ruiz, R. Kurtev, T. Cattermole, C. Cardoso.... (2013) A deep WISE search for very late type objects and the discovery of two halo/thick-disk T dwarfs: WISE 0013 0634 and WISE 0833 0052. arXiv. arXiv: 1308.0495v1

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