Thursday 31 July 2014

Measuring the Weight of the Milky Way

The Milky Way is lighter than previously thought, according to new research published by British scientists.

Research conducted by the University of Edinburgh this is the first time the study was able to measure accurately the mass of the galaxy that contains the Solar System. The Milky Way contains only half the mass of its neighboring Andromeda galaxy, which has a spiral structure.

"We had been suspected that Andromeda is bigger than the Milky Way, but measuring the weight of the two galaxies simultaneously, proved to be a very challenging thing," said Jorge Penarrubia who led the study.

dark matter

This study concluded that the extra mass of the Andromeda galaxy in the form of material substance gelap-- less dipahami- invisible but is responsible for most regions outside the galaxy.

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Scientists estimate that the Milky Way contains about half as dark matter galactic neighbor, even though both come from the same dimension.

Milky Way and Andromeda galaxies are the two largest in the region known to astronomers as the Local Group.

Ninety percent of the material in the two galaxies are not visible, and until now, scientists have been able to prove where gakasi greater. Previous studies only measure the mass in the galaxy, but this new study is able to calculate how much unseen material contained in the outer regions.

help understand

The researchers say the findings will help them to understand how the outer region of the galaxy is structured: "Our study is a combination of the latest measurements of the relative motion between the Andromeda galaxy and the largest catalogs of nearby galaxies ever devised," said Penarrubia.

The findings of this study are supported by research at the University of Cambridge, which uses different data sets. The study was published in the journal of the Royal Astronomical Society.