Dark matter has not been found around the Sun. Free Technical Library News

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No dark matter found around the sun

26.04.2012

A group of Chilean astronomers working at the La Silla Observatory, part of the European Southern Observatory, did not detect the expected dark matter in a large "piece" of galactic space around the Sun.

The main goal of the Chilean research was precisely the search for dark matter. As previously thought, it is everywhere, concentrated in the centers of galaxies, and even, perhaps, in some special intergalactic cavities. The Sun is almost the outermost star of the Milky Way. Thus, if the total mass of dark matter is 80% of the entire mass of the Universe, then in our galactic "outback" for each volume of space equal to the volume of the Earth, there should be at least 400 grams of matter.

Using the telescopes of the La Silla Observatory, astronomers examined 400 giant stars located at a distance of up to 13 light-years from the Sun. Scientists with record accuracy determined the characteristics of their movement and, on this basis, calculated the mass of the indicated sphere. And they were amazed to find that this mass coincides with the mass of stars, gas and dust that are there. There was simply no place for dark matter in our microdistrict of the Galaxy. Strictly speaking, the measurement error in the experiment made it possible to detect dark matter if its mass in space with the volume of the Earth exceeded 70 grams. This did not happen.

"Calculations show that dark matter must have manifested itself in our measurements," says Christian Moni Bidin of the Astronomy Department of the Chilean Research University, "but it's not there!"

If this discovery is confirmed, then scientists will have to look for another solution to the "missing mass" problem, since all the facts indicate that there is still some kind of invisible gravitational influence. Galaxies, including the Milky Way, spin faster than they should, there are many other inconsistencies that only the presence of dark matter could explain so far.

Christian Moni Bidin is very hopeful that the European Space Agency's future orbital observatory, called Gaia, will shed light on this dark mystery. It is planned that this optical telescope will start operating in 2013. He will draw up a detailed map of the Milky Way and indicate the coordinates of more than a billion stars.

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