Tag: HERCULES

Colossal rogue star on collision course with our solar system…in 240,000 years




Excerpt from
thespacereporter.com

It may seem like something sourced directly from the fever dreams of Michael Bay, but it’s true. The star known as HIP 85605 is on a collision course with our solar system.

We need not worry, however. According to study conducted by Dr. Coryn Bailer-Jones of the Max Planck Institute for Astronomy in Heidelberg, the binary star from the Hercules constellation will pass by our system at a distance of 0.04 parsecs.

Despite what Han Solo would have you believe, a parsec is a unit of distance and .04 parsecs translates to 8,000 times the distance between the Earth and the Sun.

If that is still too close for comfort, know that this astronomical drive-by won’t occur for at least another 240,000 years.

“Even though the galaxy contains very many stars the spaces between them are huge,” Bailor-Jones said. So even over the (long) life of our galaxy so far, the probability of any two stars have actually collided—as opposed to just coming close—is extremely small.”

The close encounter (on a universal scale, anyway) will be the first since a gas giant passed within 0.35-1.34 pc of our solar system over 3.8 million years ago, according to Bailor-Jones.

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Our Milky Way strips nearby galaxies of star-forming hydrogen


 Artist's impression of the Milky Way. Its hot halo appears to be stripping away the star-forming atomic hydrogen from its companion dwarf spheroidal galaxies.  Image credit: NRAO/AUI/NSF
Artist’s impression of the Milky Way. Its hot halo appears to be stripping away the star-forming atomic hydrogen from its companion dwarf spheroidal galaxies. Image credit: NRAO/AUI/NSF

Excerpt from
earthsky.org

Astronomers have discovered that our nearest galactic neighbors are devoid of star-forming gas, and that our Milky Way is to blame.

New observations by large radio telescopes reveal that within a well-defined boundary around our galaxy, dwarf galaxies are completely devoid of hydrogen gas. Beyond this point, dwarf galaxies are teeming with star-forming material. 

The Milky Way galaxy is actually the largest member of a compact clutch of galaxies that are bound together by gravity. Swarming around our home galaxy is a menagerie of smaller dwarf galaxies, the smallest of which are the relatively nearby dwarf spheroidals, which may be the leftover building blocks of galaxy formation.

Further out are a number of similarly sized and slightly misshaped dwarf irregular galaxies, which are not gravitationally bound to the Milky Way and may be relative newcomers to our galactic neighborhood.

Kristine Spekkens is an assistant professor at the Royal Military College of Canada and lead author on a paper published in the Astrophysical Journal Letters. She said:
"Astronomers wondered if, after billions of years of interaction, the nearby dwarf spheroidal galaxies have all the same star-forming ‘stuff’ that we find in more distant dwarf galaxies."

Previous studies have shown that the more distant dwarf irregular galaxies have large reservoirs of neutral hydrogen gas, the fuel for star formation. These past observations, however, were not sensitive enough to rule out the presence of this gas in the smallest dwarf spheroidal galaxies. 

Spekkens said:
"What we found is that there is a clear break, a point near our home galaxy where dwarf galaxies are completely devoid of any traces of neutral atomic hydrogen."
 Bottom line: New observations by large radio telescopes reveal that within a well-defined boundary around our galaxy, dwarf galaxies are completely devoid of star-making hydrogen gas. Astronomers say our Milky Way is to blame.

Known Milky Way satellite galaxies.  Click here for more about this diagram.
Neighboring galaxies to our own Milky Way (Descriptions below)
 

NAME DISTANCE (kpc) DISCOVERY PAPER
Canes Major 7.2Martin et al. 2004, A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion on to the Milky Way
Segue 317 Belokurov et al. 2010, Big Fish, Little Fish: Two New Ultra-Faint Satellites of the Milky Way
Segue 123 Belokurov et al. 2007, Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
Sagittarius24Ibata, Gilmore & Irwin, 1994, A dwarf satellite galaxy in Sagittarius 1995, Sagittarius: the nearest dwarf galaxy
Segue 234.7 Belokurov et al. 2009, The discovery of Segue 2: a prototype of the population of satellitesof satellites
Bootes II 43 Walsh, Jerjen & Willman, 2007, A Pair of Bootes: A New Milky Way Satellite
Coma 44 Belokurov et al. 2007, Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
Willman 1 (SDSSJ1049+5103) 45Willman et al. 2005, A New Milky Way Companion: Unusual Globular Cluster or Extreme Dwarf Satellite?
Bootes III 46Grillmair 2009, Four New Stellar Debris Streams in the Galactic Halo
LMC 50.8-
SMC 59.7-
Bootes 60 Belokurov et al. 2006, A Faint New Milky Way Satellite in Bootes
Ursa Minor 66A.G. Wilson of the Lowell Observatory in 1955, Sculptor-Type Systems in the Local Group of Galaxies
Sculptor (Scl) 79discovered in 1938 by Harlow Shapley, A Stellar System of a New Type
Draco 82 A.G. Wilson of the Lowell Observatory in 1955, Sculptor-Type Systems in the Local Group of Galaxies
Sextans 89 Mike Irwin, M.T. Bridgeland, P.S. Bunclark and R.G. McMahon, 1990 A new satellite galaxy of the Milky Way in the constellation of Sextans
Ursa Major (UMa) 100Willman et al. 2005, A New Milky Way Dwarf Galaxy in Ursa Major
Carina 103Cannon, R. D., Hawarden, T. G., & Tritton, S. B., 1977, A new Sculptor-type dwarf elliptical galaxy in Carina
Hercules 140 Belokurov et al. 2007, Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
Fornax 140discovered in 1938 by Harlow Shapley, described in "Two Stellar Systems of a New Kind", Nature, Vol. 142, p. 715
Canes Venatici II 150 Sakamoto & Hasegawa 2006, Discovery of a Faint Old Stellar System at 150 kpc
Leo IV 160 Belokurov et al. 2007, Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
Pisces II 182 Belokurov et al. 2010, Big Fish, Little Fish: Two New Ultra-Faint Satellites of The Milky Way
Leo II (Leo B) 208 Robert G. Harrington and Albert George Wilson, 1950, Two New Stellar Systems in Leo
Canes Venatici 220Zucker et al. 2006 A New Milky Way Dwarf Satellite in Canes Venatici
Leo I 254 Robert G. Harrington and Albert George Wilson, 1950, Two New Stellar Systems in Leo

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Sheldan Nidle Update 2-28-12 – An epoch of prosperity, freedom, and sovereignty is coming into being for all to see!

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4 Kan, 17 Zac, 8 Manik

Dratzo! We return! The ultimatums, and the pressures resulting from them, have forced the resignations of many in the lower levels of the dark cabal. This marks the beginning of the denouement which will bri...

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I am In The US Navy Space Command And I Have Been To Elenin — Ask Me A Question

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This is pretty interesting!

EagleEyes

http://www.godlikeproductions.com/forum1/message1578548/pg1

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The mysterious island of Hy-Brasil: The ‘other’ Atlantis

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On January 20, 2011, in Legends & Folklore, People & Places, UFO's & Aliens, by James

It is undisputed that the most famous ‘lost island’ is Atlantis. But there is another island which is just as myste...

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Have scientists found Atlantis?

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NORTHAMPTON, Mass (Reuters) - A U.S.-led research team may have finally located the lost city of Atlantis, the legendary metropolis believed swamped by a tsunami thousands of years ago in mud flats in southern Spain.

"This is...

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Theoretical Breakthrough: Generating Matter and Antimatter from Nothing

ScienceDaily (Dec. 8, 2010) — Under just the right conditions -- which involve an ultra-high-intensity laser beam and a two-mile-long particle accelerator -- it could be possible to create something out of nothing, according to Universit...

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