An INCREDIBLE Journey of the Most BEAUTIFUL Discoveries of the Universe by JAMES WEBB 2024 SpaceDocu : • IN 2024! An INCREDIBLE...
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🌍 Does a vacuum exist in space? Just as amateur astronomers tend to point their telescopes at regions dense with stars and galaxies, astrophysicists and scientists have been slow to address the question of the void in space. In fact, although it's a fascinating question, little research had been done on the void in space until recently. Instead, researchers were trying to understand stars, planets, galaxies and their interactions in the Universe.
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💥 :
- The question of the void in the Universe isn't as simple as you might think. In fact, the answer is quite complex. To begin with, you need to know that when we talk about the void, there can be several interpretations of this notion of "emptiness". In other words, there are several forms of emptiness. There's the absolute vacuum, which probably doesn't exist, but we'll come back to that later. But there's also the vacuum of space, which occupies almost 90% of the volume of the observable Universe. And the vacuum of space itself differs depending on whether we're talking about the galactic vacuum or the interstellar vacuum, for example! So yes, the void exists in space, but in different forms.
How can there be a vacuum in space, you may ask? Vacuum is in fact all around us. It is the binder of the Universe's great structures.
The cosmological principle states that the Universe is homogeneous and isotropic. In other words, no matter where we stand to observe it, or which direction we look in, it's identical. But on a smaller scale, this principle breaks down. On closer inspection, the Universe appears to be made up of large structures. Galaxies like the Milky Way group together in galaxy clusters and superclusters like the Local Group, our galaxy cluster, or the Virgo Supercluster, which groups together the Local Group and other galaxy clusters like the Virgo Cluster. These galaxy clusters and superclusters come together to form large filaments, which delimit the contours of cosmic voids. These cosmic voids are immense spaces where the density of galaxies is very low. As we've seen, they account for 90% of the volume of the observable Universe, so there's a lot of empty space out there!
The size of these voids can vary. While there are very small void zones, or at any rate, relatively small on the scale of the Universe, there are also void zones stretching over 1 billion light-years in radius. These immense void zones are known as super-voids. Where do these gigantic void zones come from? What are they made of? How did they form, and how are they evolving? Supervoids conceal many mysteries, some of which scientists have already cracked, while others have yet to be elucidated.
The Bouvier Void made news again recently, in September 2023, with the discovery of an astonishing structure described as a "bubble of galaxies". This bubble of galaxies appears on images as a spherical shell with a core composed of a supercluster of Bouvier galaxies, surrounded by the great Bouvier Void, and girdled by other superclusters and galactic filaments such as the Great Sloan Wall. This structure is colossal in size: it has been estimated to be 1 billion light-years across, or 10,000 times larger than our galaxy! According to a study published in Astrophysical journal, its genesis dates back to the earliest days of the Universe, some 13.8 billion years ago.
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🎬 Today's program:
- 00:00 - Introduction
- 05:06 - The Void of the Bouvier
- 14:37 - The discovery of voids in the Universe
- 18:00 - The Universe, one big cosmic web
- 22:25 - Does an absolute vacuum exist?
- 36:00 - Definition of a vacuum
- 41:57 - Voids discovered in the observable Universe
- 42:39 - The Local Vacuum
- 51:20 - The KBC Vacuum
- 58:00 - Boreal Super Local Vacuum
- 59:50 - Eridan Vacuum
- 01:08:28 - The Giant Void
- 01:09:45 - Why study vacuum?
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22 май 2024
