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Latest Galactic orientation Stories

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2010-01-14 11:10:00

For more than two decades, the cold dark matter theory has been used by cosmologists to explain how the smooth universe born in the big bang more than 13 billion years ago evolved into the filamentary, galaxy-rich cosmic web that we see today. There's been just one problem: the theory suggested most galaxies should have far more stars and dark matter at their cores than they actually do. The problem is most pronounced for dwarf galaxies, the most common galaxies in our own celestial...

2009-01-27 11:17:15

Israeli scientists have proposed a new theory of how galaxies were formed in the universe billions of years ago. The theory, formulated by Hebrew University of Jerusalem cosmologists led by Professor Avishai Dekel, takes issue with the prevailing view on how galaxies came to exist. The new theory -- based on advanced astronomical observations and computer simulations -- maintains galaxies primarily formed as a result of intensive cosmic streams of cold gas and not, as current theory contends,...

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2008-06-10 09:00:00

NASA's Hubble Space Telescope captures the magnificent starry population of the Coma Cluster of galaxies, one of the densest known galaxy collections in the universe. The Hubble's Advanced Camera for Surveys viewed a large portion of the cluster, spanning several million light-years across. The entire cluster contains thousands of galaxies in a spherical shape more than 20 million light-years in diameter. Also known as Abell 1656, the Coma Cluster is over 300 million light-years away. The...

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2006-04-20 18:29:02

Try mixing caramel into vanilla ice cream -- you will always end up with globs and swirls of caramel. Scientists are finding that galaxies may distribute themselves in similar ways throughout the universe and in places where there is lots of so-called dark matter. "Our findings suggest that unseen dark matter -- which emits no light but has mass -- has had a major effect on the formation and evolution of galaxies, and that bright active galaxies are only born within dark matter clumps of a...

2006-04-05 11:31:14

A new image of the centre of a cluster of galaxies has revealed massive filamentary structures that give a rare insight into the evolution of galaxy clusters. "The star forming regions in the cluster that we'd observed previously were just the tip of the iceberg.  We've now observed filaments of gas streaming out from these regions that are approximately 490 thousand light years across. The gaseous trails mark the path of galaxies travelling at high speed through the cluster. The origin...

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2006-04-04 18:55:00

Astronomers from the University of Nottingham, UK, and the Instituto de Astrofisica de Canarias (Spain), have found the first observational evidence that galaxies are not randomly oriented. Instead, they are aligned following a characteristic pattern dictated by the large-scale structure of the invisible dark matter that surrounds them. This discovery confirms one of the fundamental aspects of galaxy formation theory and implies a direct link between the global properties of the Universe and...


Word of the Day
omadhaun
  • A fool; a simpleton: a term of abuse common in Ireland and to a less extent in the Gaelic-speaking parts of Scotland.
This word is partly Irish in origin.