A star is ejected from our galaxy through a black hole

The star, the same size as the Sun, has been sighted leaving our galaxy at a speed ten times faster than any star. It is the first time that it is demonstrated that a black hole can expel this type of stars.

Many times we have questioned how big our universe is. A totality of space and time where various celestial bodies and galaxies inhabit such as the Milky Way. A milestone has recently been discovered in the world of astronomy: a star ejected from our galaxy at a speed of 6 million kilometers per hour and will leave the Milky Way within a hundred million years, a relatively short term if we talk within the Science that studies the universe.

This fast star, called S5-HVS1, has a size similar to the Sun. With the difference that the Sun is a star of type G and this is of type A.

What difference there are? This nomenclature is due to the Morgan-Keenan classification, where it explains that a star is of one type or another due to the amount of temperature it has. Being “O” the highest level and “M” the lowest. This means that the star S5-HVS1 has more temperature than the Sun.

Why is this event important?
This discovery is of great importance. Astronomers knew firsthand that there are stars that travel at high speed, but did not know that they could be ejected through black holes.

The black hole causing this fact is located in the heart of our galaxy and is called Sagittarius A *. Experts confirm that the black hole ejected the star five million years ago at a speed of thousands of kilometers per second.

The Hills mechanism
How can a black hole make a star ejected from our galaxy possible? For this we have to explain the mechanism of Hills, theory proposed by the astronomer Jack Hills.

This theory explains that originally this celestial body had a binary partner, but they deviated to Sagittarius A *. Due to the gravitational forces of the black hole, the star S5-HVS1 was fired at high speed while his companion stayed in Sagittarius A *.

This is the first demonstration of the Hills mechanism since it was proposed thirty years ago.

This discovery was made by chance when a group of researchers led by Sergey Koposov of Carnegie Mellon University (USA). They discovered that this celestial body passed relatively close to our planet, just 29,000 light years away.

As you have seen, these events happen beyond the Earth where millions of stars are in motion in a universe that has no end and that every second that passes is expanding.

Would you like to know more about our galaxy and how certain trips to space have taken place? In the Fundación Telefónica you can find the De Madrid a la Luna exhibition, available until February 2020, where it explains why the arrival of man on the Moon was a success and what role Spain played to carry out this mission.

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