January 17, 2022

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Sequência de supernovas pode ter criado enorme "bolha" formadora de estrelas

The supernova sequence may have formed a ‘bubble’ forming a massive star

Thousands of stars are formed Milky Way environment As a result of a series of more than ten supernova eruptions that occurred 14 million years ago, it formed a huge bubble that caused all the young stars closest to us to form. This discovery was made by astronomers at the Astronomy Center | Harvard & Smithsonian (CfA) and the Space Telescope Science Institute (STScI).

The authors explored a large bubble with a dense surface, which is thousands of “Baby stars”- and the earth sits in the middle of this structure. “It simply came to our notice then. For the first time, we can explain how the formation of all nearby stars began, “said Catherine Zucker, co-author of the study.

The so-called “local bubble” was discovered by astronomers in the 1970s and they observed that no stars formed in it for about 14 million years. The only stars that were in the bubble were already there, before the system appeared, or formed outside of it and passed through it. If so, this would suggest Supernova eruptions Would have released the materials needed to create new stars.

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In the new study, the authors mapped the areas where star formation occurs near the bubble. Although its existence has been known for decades, only now have they been able to see and understand how it formed and the impact of the gas around it. They also created an interactive three-dimensional model that exposes all young stars and areas that form stars 500 light-years away from Earth in a local bubble.

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This model was created based on new data and data science techniques and shows how the sequence of supernovae that first erupted 14 million years ago pushed galaxy gas forward. This is how the bubble-shaped structure was born New stars. Today, it is already known that the bubble contains seven molecular clouds that are considered to be part of the formation of stars.

What do you know about the Milky Way bubble

The study authors noted that the bubble is not dormant and grows slowly. “It travels at a speed of 20 km per hour and has lost most of its power, which is practically constant in terms of speed,” he said. The Gaia mission of the European Space Agency.

Representing the local bubble, the sun is almost at its center (Image: Reproduction / Leah Hustak (STScI)

Jono Alves, co-author of the study, explains that when the first supernova that created the local bubble exploded, the sun was far away from all action. “But about five million years ago, The The path of the sun The whole galaxy brought him into the bubble, and today he is fortunately almost at its center, ”he said. In practice, this means that there is practically a “VIP space” to observe the star formation processes taking place on the surface of the bubble.

Now the team plans to map the new galaxies to get a full three-dimensional view of their locations, shapes and sizes. By analyzing the bubbles and their relationship, one can understand the role that stars play in the formation of others at the end of their lives, along with the effects of stellar structure and evolution. Milky Way galaxies.

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The article with the study results was published in the journal Nature.

Source: Natural; Via: Harvard Astronomical Center