Hypervelocty Stars: What are They?

By: Tsegazeab Beteselassie

Supermassive black hole: This is the start of a hypervelocity star.
Link:www.livescience.com 

In our galaxy, there are millions of millions of stars. Since our galaxy is a spiral galaxy, the spirals are spinning. That means our star, and every star, is moving very, very, fast, up to a million miles per hour. But not relative to each other. But there is a class of stars that are moving the same speed, but in a very different way. They are called "Hypervelocity Stars".

 

    What are they? You may ask. Well, they are stars that can travel up to a million miles per hour. That seems normal because normal stars are traveling the same speed. But that speed is not relative. So compared to other stars, hypervelocity stars are moving a million more miles an hour. That's 0.2% of the speed of light! But how can these hypervelocity stars move that fast?

 

    Since stars move at a million miles per hour, and since their should be tiny differences, shouldn't the faster ones be the hypervelocity stars? The answer is no. The reason is that most velocities (except the speed of light) add up. So the stars can't be the faster ones in a spiral galaxy. Also there is another problem. Stars like these come like, once in every ten thousand years. I don't think that there is a means to propel a star a million more miles per hour in a spiral arm. So we need another theory. But what other reason could they're be for a hypervelocity star?

Stars: These are stars being shot out of our galaxy.
Link:www.livescience.com 

    Since hypervelocity stars are moving so fast, their existence shouldn't be possible. But they do exist, because they were tracked and proven by astronomers. So how can they move so fast? Maybe they can use black holes to go so fast. How do you do that? Like this. Let's say you have a string with a ball at the end. Then you spin it. It goes faster and faster. Then you let go. It flies away from you. Maybe the same thing can happen with stars. But a stellar (normal) black hole can't accelerate a star that fast. But there is one black hole that can. A supermassive black hole.*

    So here's how it works. A pair of binary stars whirl around each other at the center of the galaxy. One of them gets sucked into a black hole, while the other whirls around it. Soon, it becomes so fast it gets shot out of the gravity's grip. It zips out of the galaxy (after a long time). But there is a mystery behind this. Only suppermassive stars get shot out. Why? I don't know. But this is how a hypervelocity star works.

*This idea isn't actually mine.

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