Comets are unpredictable beasts
By Mike Barrett
The media was full of talk of comets with the inaugural visit of Comet ISON C/2012 S1. It was pre-hyped as being “The Comet of the Century”, being visible in daylight etc, etc. The reality of the matter is that comets are strange beasts and are rarely predictable unless they have been round a few times.
Comet ISON was spotted a long way out in the solar system and had been tracked all the time it was approaching the Sun. This meant that it was reasonably easy to predict its trajectory as it came flying in towards the Sun. The first thing that was realised was that this would be a Sun-grazing comet coming within one Sun’s width of our primary star. This was special for a number of reasons, but most especially because we now have so many instruments that are able to observe the Sun and have the capability to view the interaction between the comet and the Sun.
But we are getting ahead of ourselves, first we need to understand what comets are and where they came from: A comet is a small icy body composed of rock, ice, and dust. The ice is created not only from water, but also from gasses such as oxides of carbon, etc and many organic compounds. It has been proposed that some of the water on Earth and also possibly the building blocks of life were deposited by a passing comet. Generally there is more ice than solid components in a comet, though some comets can contain more solids than ice. A suitable analogy to an earthbound structure would be that of a dirty snowball and these comets are often described as such.
Continue reading the article at http://www.rocketstem.org/2014/01/14/astronomy-comets-unpredictable-beasts/
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