Around what circles our sun?

The centre of our galaxy - Comment on 2012 October 7

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2012 October 7

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The gigantic black hole in the centre of our galaxy, the Milky Way, has about four million times the mass of our sun. Read more:

I am bringing excerpts of an article, which also deals with the centre of our galaxy, and after that some notes:

 

Astronomers have discovered the until now closest companion of the gigantic black hole in the centre of our Milky Way. The star with the catalogue number S0-102 orbits the black hole in only 11.5 years, the team around Andrea Ghez of the University of California in Los Angeles (UCLA) reports in the US periodical "Science”. The discovery allows a test of Albert Einstein‘s general theory of relativity in an area not explored until now.

The general theory of relativity predicts that mass bends space and time. In the centre of our galaxy, the Milky Way, resides an extreme mass rich black hole, which has four million times the mass of our sun and therefore is to bend space-time measurably. Before the discovery of S0-102 a star with a circulation period around the black hole of 16 years was discovered. It has the number S0-2.

As the planets orbit our sum, so circle the stars S0-102 and S0-2 around the black hole – though on a strongly egg-shaped (elliptic) course.

 

Already two years ago I dealt with the centre of our galaxy, 2010 Sep 12 – Gigantic suns, and there were reports about stars of the size of about 2000 sun diameters.

Here is now a black hole mentioned, which has about four million times the mass of our sun and that this black hole is in the centre of our Milky Way. And about the two stars it is said that they orbit the black hole. Around what now circles our sun?

Here now what another article has to say:

At the very centre of the Galaxy lies a remarkable object - in all likelihood a massive black hole surrounded by an accretion disk of high-temperature gas. Neither the central object nor any of the material immediately around it can be observed at optical wavelength because of the thick screen of intervening dust in the Milky Way. The object, however, is readily detectable at radio wavelength and has been dubbed Sagittarius A by radio astronomers.

 

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