Au-Delà de la Voie Lactée : Voyage vers les Mystérieux Confins de notre Galaxie DOCUMENTAIRE Espace
Orbinéa | Le Monde des Odyssées
394,711 views
🌍 What do worlds beyond our galaxy look like? The Universe around us has yet to reveal its limits. While we now know the boundaries of our Galaxy, the Milky Way, our current measuring instruments cannot yet determine whether the Cosmos itself is limitless. However, at present, the observable part of the Universe appears to be a sphere 93 billion light-years in diameter. The cosmological horizon is estimated to be about 45 billion light-years from Earth. Nevertheless, light emitted by distant objects gradually reaches us. This hypothetical boundary is therefore dynamic, and the observable Universe is expanding over time.
Scientists, who long considered our Galaxy to be the center of the Universe, now know that this is not the case. They have long understood that our Sun is just one star among many. Moreover, they were able to establish that our Galaxy represents only a tiny fraction of the cosmic immensity, despite its somewhat astronomical dimensions on a human scale. Indeed, our Galaxy alone measures nearly a hundred thousand light-years in length and a thousand light-years in thickness. Compared to the scale of the Universe, which contains trillions of galaxies, it's safe to say it represents only a grain of sand in the desert.
The Milky Way, because our solar system is part of it and therefore includes the objects closest to us, has accumulated a considerable amount of research and observation. While it has revealed many of its secrets, it is clear that new information will be uncovered as technology advances. But do you think you know everything about our Galaxy? Do you have any idea what surrounds it? Do you think that in the vastness of space, millions or even billions of light-years away, the celestial bodies present behave differently?
🔥 As a reminder, videos are published on SUNDAYS at 6:00 PM.
-------------------------
💥 Beyond the Milky Way:
• The Milky Way exists in the Universe amidst countless stars. However, it has been established that it is part of a group of galaxies known as the Local Group. This group contains more than 60 galaxies, primarily dwarf galaxies, all bound together by common gravitational forces. Yet, this Local Group represents only a tiny fraction of an even larger cluster of galaxies, the Virgo Supercluster, of which it is located on the periphery. This supercluster comprises at least 100 groups and clusters of galaxies and could be nearly 200 million light-years in diameter. It itself belongs to an even more gigantic structure, the Laniakea Supercluster. The latter, composed of more than 100,000 galaxies and spanning over 520 million light-years, has not, however, convinced all scientists. Indeed, some believe that the galaxies in this latter structure are not gravitationally bound and, consequently, that these subgroups should disperse over time. But let's return to the Local Group. Despite its small size, it serves as a comprehensive catalog. It includes practically all types of galaxies, except for giant elliptical galaxies, which cannot be present in such a small structure, relatively speaking, compared to our human scale!
The Local Group is approximately 10 million light-years in diameter and its total mass is estimated at 2.3 trillion solar masses. The most distant galaxies in our solar system are about 5 million light-years away. While it is primarily home to dwarf galaxies, it also contains three large and massive galaxies: the Andromeda Galaxy, which is probably the largest; the Triangulum Galaxy, which is the smallest; and, of course, our own Milky Way.
-------------------------
🎬 Today's program:
00:00 - Introduction
03:15 - The Milky Way - Surprising Facts
06:26 - The Local Group
09:10 - Near Environment of the Milky Way
16:56 - Birth of Andromeda
20:15 - The Sagittarius Dwarf Irregular Galaxy
23:30 - The IC10 Galaxy
28:03 - The Cadwell 51 Galaxy
31:37 - The Phoenix Dwarf Galaxy
34:01 - The Tucan Dwarf Galaxy
36:24 - The Wolf-Lundmark-Melotte Galaxy
39:09 - The Leo A Galaxy
41:39 - Supernova Remnant LMC N49
45:03 - Large Clouds Speed
50:00 - The galaxy HVC 127-41-330
53:32 - A prodigiously long black hole jet
55:58 - Perseus A, the giant galaxy
01:01:13 - The gravitational wave signal GW190814
01:04:32 - The quasar HE0450-2958
01:09:14 - What's Next?
Orbinea is an official channel affiliated with the network ©Production Orbinea
20 Comments
Toujours aussi passionnant et magnifiques illustrations.
ça sert pour faire dodo ... ou calmer mes neveux/nièce quand ils s'énerve !
au top ;)
Merci à vous Orbinéa
À 5mn 04 s. Il n'est pas certain que la Voie lactée et Andromède se rencontrent. Chacune se meut avec son escorte de galaxies naines; elles représentent à elles deux 95 % de cette masse en sachant qu'Andromède est deux fois plus massique. Elles semblent aller l'une vers l'autre à environ 130 km/s en vitesse cumulée; mais au vu des dernières mesures du satellite Gaia, il n'est pas sûr que les deux se fusionnent; les erreurs dominent les mesures. Cela pourrait se faire dans 3 milliards d'années au plus tôt ou dans 10 milliards d'années ou plus, ou bien jamais.
Au-Delà de la Voie Lactée : Voyage vers les Mystérieux Confins de notre Galaxie DOCUMENTAIRE Espace
Orbinéa | Le Monde des Odyssées
394,711 views
🌍 What do worlds beyond our galaxy look like? The Universe around us has yet to reveal its limits. While we now know the boundaries of our Galaxy, the Milky Way, our current measuring instruments cannot yet determine whether the Cosmos itself is limitless. However, at present, the observable part of the Universe appears to be a sphere 93 billion light-years in diameter. The cosmological horizon is estimated to be about 45 billion light-years from Earth. Nevertheless, light emitted by distant objects gradually reaches us. This hypothetical boundary is therefore dynamic, and the observable Universe is expanding over time.
Scientists, who long considered our Galaxy to be the center of the Universe, now know that this is not the case. They have long understood that our Sun is just one star among many. Moreover, they were able to establish that our Galaxy represents only a tiny fraction of the cosmic immensity, despite its somewhat astronomical dimensions on a human scale. Indeed, our Galaxy alone measures nearly a hundred thousand light-years in length and a thousand light-years in thickness. Compared to the scale of the Universe, which contains trillions of galaxies, it's safe to say it represents only a grain of sand in the desert.
The Milky Way, because our solar system is part of it and therefore includes the objects closest to us, has accumulated a considerable amount of research and observation. While it has revealed many of its secrets, it is clear that new information will be uncovered as technology advances. But do you think you know everything about our Galaxy? Do you have any idea what surrounds it? Do you think that in the vastness of space, millions or even billions of light-years away, the celestial bodies present behave differently?
🔥 As a reminder, videos are published on SUNDAYS at 6:00 PM.
-------------------------
💥 Beyond the Milky Way:
• The Milky Way exists in the Universe amidst countless stars. However, it has been established that it is part of a group of galaxies known as the Local Group. This group contains more than 60 galaxies, primarily dwarf galaxies, all bound together by common gravitational forces. Yet, this Local Group represents only a tiny fraction of an even larger cluster of galaxies, the Virgo Supercluster, of which it is located on the periphery. This supercluster comprises at least 100 groups and clusters of galaxies and could be nearly 200 million light-years in diameter. It itself belongs to an even more gigantic structure, the Laniakea Supercluster. The latter, composed of more than 100,000 galaxies and spanning over 520 million light-years, has not, however, convinced all scientists. Indeed, some believe that the galaxies in this latter structure are not gravitationally bound and, consequently, that these subgroups should disperse over time. But let's return to the Local Group. Despite its small size, it serves as a comprehensive catalog. It includes practically all types of galaxies, except for giant elliptical galaxies, which cannot be present in such a small structure, relatively speaking, compared to our human scale!
The Local Group is approximately 10 million light-years in diameter and its total mass is estimated at 2.3 trillion solar masses. The most distant galaxies in our solar system are about 5 million light-years away. While it is primarily home to dwarf galaxies, it also contains three large and massive galaxies: the Andromeda Galaxy, which is probably the largest; the Triangulum Galaxy, which is the smallest; and, of course, our own Milky Way.
-------------------------
🎬 Today's program:
00:00 - Introduction
03:15 - The Milky Way - Surprising Facts
06:26 - The Local Group
09:10 - Near Environment of the Milky Way
16:56 - Birth of Andromeda
20:15 - The Sagittarius Dwarf Irregular Galaxy
23:30 - The IC10 Galaxy
28:03 - The Cadwell 51 Galaxy
31:37 - The Phoenix Dwarf Galaxy
34:01 - The Tucan Dwarf Galaxy
36:24 - The Wolf-Lundmark-Melotte Galaxy
39:09 - The Leo A Galaxy
41:39 - Supernova Remnant LMC N49
45:03 - Large Clouds Speed
50:00 - The galaxy HVC 127-41-330
53:32 - A prodigiously long black hole jet
55:58 - Perseus A, the giant galaxy
01:01:13 - The gravitational wave signal GW190814
01:04:32 - The quasar HE0450-2958
01:09:14 - What's Next?
Orbinea is an official channel affiliated with the network ©Production Orbinea