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Archive for February 25th, 2013

Let’s look at the matter of Matter vs. Anti-Matter?

Posted by obelkobusnel on February 25, 2013

Some interesting news regarding this matter from NASA…

 

End of Post

Posted in AstroPhysics | Leave a Comment »

Comets (Comet Ison – due to be visible in November 2013)

Posted by obelkobusnel on February 25, 2013

 

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COMET ISON: BRIGHTER THAN THE FULL MOON

A comet is a small object that, when it approaches the sun, develops a visible coma (atmosphere) and sometimes a tail or two tailsthese two traits distinguish comets from asteroids (comets that approach the sun and do not present these features are called extinct comets). Most comets originate from the Kuiper Belt or the Oort Cloud and have orbital periods ranging from a few years to many centuries, but some pass through the inner solar system only once before entering interstellar space. Comet Encke has an orbital period of three years, the shortest of any known comet, while Comet Catalina‘s orbital period is estimated to be about six million years – its last sighting was recorded on March 23, 1999.

The brightest comet in recorded history has been Caesar’s Comet. It was observed on May 18, 44 BCE in modern-day Beijing and July 23-25, 44 BCE in Rome. It is only one of five comets in recorded history to have had a negative magnitude at -4.0. In the spring of 1910, Halley’s Comet appeared with an apparent magnitude of around 0. Comet Hale-Bopp, also the Great Comet of 1997, became visible with the naked eye in May 1996 and had a magnitude of around 10.6. In the winter of 2013, Comet Ison will become visible to the naked eye, and some scientists estimate that it will reach magnitude -11.6 – brighter than the full moon.

Comet Ison (officially C/2012 S1) was discovered on September 21, 2012 by Vitali Nevski from Vitebsk, Belarus. Its orbital period is not currently known, but it will reach perihelion on November 28, 2013 at a distance of 1.1 million kilometers from the surface of the sun. Observation of the comet has led some scientists to believe that Comet Ison and Newton’s Comet, which reached maximum brightness of 2 on December 29, 1680, may have fragmented from the same parent body.

– RA

Image: An artist’s rendition of the Earth as it passes through the tail of Comet Ison, an event which is expected to occur during January 2014. This could create a meteor shower around January 14 or 15, 2014. (Source: http://frenchtribune.com/sites/default/files/imagecache/article/comet-ison-sky-in-2013.jpg

Sources:
http://www.huffingtonpost.com/2012/12/31/comet-coming-in-2013-ison_n_2388685.html
http://www.independent.co.uk/news/science/brighter-than-a-full-moon-the-biggest-star-of-2013-could-be-ison–the-comet-of-the-century-8431443.html
http://www.space.com/17918-9-most-brilliant-great-comets.html

End of Post

 

Posted in AstroPhysics | Leave a Comment »