When you look into the night sky, you see many stars that have not moved much in relation to our own planet in a very, very long time. However, some of the stars in our home galaxy are not so happy, and astronomers have recently found one that leaves the Milky Way, and they believe they know why.
The star known for its The label S5-HVS1 came a little too close to the supermassive black hole in the center of our galaxy about five million years ago. The black hole has thrown it away at incredible speed and it's moving so fast that it's essentially expelled from our galaxy.
"The speed of the discovered star is so high that it will inevitably and never leave the galaxy," explains Douglas Boubert, co-author of a new article on the star published in Monthly Notices of the Royal Astronomical Society. But how fast is "fast"?
It is believed that the star discovered during the spectroscopic study of the southern star stream moves at a distance of about 6 million kilometers per hour. Galaxies like the Milky Way are full of stars that are always in motion, but rarely does a star reach such speeds. Researchers say the S5-HVS1
What does that mean for the star? Well, it's not good. The star is on its way out of the Milky Way as we speak, and its incredible speed makes it unlikely that it can ever "fall back" into our galaxy.
"This is super exciting, as we have long suspected, that black holes can eject stars at very high speeds. However, we never had a clear association of such a fast star with the Galactic Center, "said lead author Sergey Koposov in a statement. "We believe that the black hole ejected the star about five million years ago at a speed of thousands of miles per second. This expulsion happened at the time when human ancestors only learned to walk on two legs. "
Pour out one for S5-HSV1. We barely knew you.