A star with a record speed has taken off from the center of the Milky Way – Naked Science


Scientists have discovered a new star by accident. They have conducted research to observe the stars in stellar currents – structures that include star clusters and dwarf galaxies in orbit around the Milky Way. The project is called S5 and one of its tasks was to look for stars with high speed of movement.

And astronomers succeeded discover one of these stars: it moved at a speed of 1,700 kilometers per second. For comparison, our planet revolves around the Sun at a speed of only 30 km / s. Having received such a record value, the scientists decided to investigate the star and its trajectory in more detail.

It has been discovered that the star, named S5-HVS1, is relatively young, with only 500 million years. Its mass exceeds solar almost 2.5 times. S5-HVS1 is the star of the main sequence of the spectral class A, like the famous scientists Sirius A, Altair and Vega. The most interesting thing is that, according to the calculations of the trajectory, this star flew out of the center of the Milky Way about 4.8 million years ago. According to the scientists, the energy needed to launch the S5-HVS1 into space is sufficient to accelerate the Earth to 99.7 percent of the speed of light.

However, the process by which the star was expelled from the center of the galaxy is still not entirely clear. But scientists have suggestions on this. The authors believe that the S5-HVS1 is, in effect, one of the components of a binary system. According to the astronomers theory, the double star, which included S5-HVS1, was close enough to a black hole in the center of the Milky Way. For this reason, one of the components of the system went through the event horizon and was absorbed. Having lost a companion, the S5-HVS1 was expelled from the center of the galaxy with tremendous power.

Another theory of scientists is that several million years ago the center of our Galaxy collided with a smaller black hole, following which many stars were thrown into space. To get more information on this star, scientists are waiting for a new version of data from the Gaia telescope, which will be released in 2021.



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