This cosmic bubble is still expanding at a speed of about six kilometers per second.
An international research team was able for the first time to find out the possible reason for the existence of the solar system in the center of a huge cosmic cavity or bubble, which could contribute to a better understanding of the history of the sun and its companions from the planets.
The WhatsApp studying, published in the journal Nature and announced in Official statement From the Harvard University Center for Astrophysics involved in the study on January 12, this team turned to data from the European Space Agency’s Gaia space observatory and aims to build a three-dimensional list of nearly one billion celestial bodies.
In addition, some ground-based telescopes were used to observe a number of stars in the vicinity of the Sun, at a distance of about 500 light-years in all directions, and then all these data were analyzed using modern data science techniques.
The Local Bubble is a convention that expresses a relative cavity found in space, in which the density of hydrogen gas (the most common element in the universe) is less than usual in its surroundings, and the sun is located in one of those cosmic bubbles.
Scientists have known this more than 50 years ago, but the reason for the presence of the sun and its planets in that bubble has always been a question under investigation, but the results of the new study provided a solution to this mystery, which is that this region of the sky witnessed 15 million years ago a number of supernovae. That expelled the gas from our solar ocean and heated the rest of it.
A supernova is the final stage in the life of some super-giant stars, in which the star collapses in a fraction of a second, causing an explosion so massive that it can be seen from a distance of millions of light years.
According to the new study, it was this series of supernovae that pushed large amounts of hot gas and dust to accumulate on the edges of the local bubble, which led to the emergence of thousands of new stars.
The researchers believe that when this bubble arose 15 million years ago, the sun was not part of it, but rather met it sometime 5 million years ago and then centered on it, and the sun and its bubble continued to move in a fixed pattern around the galaxy.
According to the new study, this cosmic bubble is still expanding at a speed of about 6 kilometers per second.
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