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supermassive star

03.03.2011

English astronomers working at an observatory in Chile have discovered a star in the Tarantula Nebula, designated R136a1. It is 300 times heavier and a million times brighter than the Sun. It is the most massive star known at present, located 165 light-years from Earth.

Since R136a1 is part of a dense star cluster, where there are a million stars per cubic light year, doubts arose: could it be that we take two, or even three, for one huge star, rotating around a common center of gravity? Such cases have already happened. However, a group of German astronomers who tested the discovery of the British, also claims that this is one superheavy star.

It remains a mystery how it can exist: according to the theory now accepted, stars that exceed the mass of the Sun by more than 150 times should be unstable.

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New research by scientists may help control obesity in the future. It turned out that there is a neural mechanism in the brain that regulates the feeling of fullness when eating. If you influence it, then you can reduce or increase the feeling of hunger. So far, the experiment has been carried out only on animals.

The neural mechanism was discovered by scientists at the Baylor College of Medicine in the United States, who used it to force laboratory mice to eat more and less than usual.

The mechanism consists of two groups of neurons. The first - DA-VTA - produces dopamine, the second - DRD1-LPBN - regulates food intake. The scientists found that the activity of the first group increased just before the mice stopped eating. After the production of dopamine occurs, the neurons from the second group turn on. They cause a desire to refuse food. When the researchers suppressed these neurons, the animals began to overeat. Artificial stimulation, on the contrary, discouraged mice from the desire to eat, according to the official website of Baylor College of Medicine.

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