🌍 In the boundless expanse of the universe, stars serve as the celestial beacons that illuminate the cosmic stage. These nuclear furnaces, from the humblest red dwarf to the most magnificent supergiant, play a pivotal role in the cosmic ballet of the cosmos. But beyond their shimmering beauty lies a universe brimming with mysteries and wonders, especially when we delve into the realm of neutron stars. Neutron stars, the remnants of supernova explosions, are objects of immense interest and research within the astronomical community. With densities that defy comprehension and gravitational fields that bend the very fabric of space-time, these stellar remnants offer a glimpse into the extreme conditions that exist beyond our Earthly experience. Today, we embark on a cosmic journey to explore the lifecycle of stars, understand the formation of neutron stars, and unravel the mysteries that these dense objects hold. Join us as we traverse the universe, from the birth of stars in nebulous cradles to the final stages of stellar evolution, highlighting the awe-inspiring phenomena of neutron stars along the way.
Neutron stars, those incredible cosmic phenomena, capture the imagination of astronomers and astrophysics enthusiasts the world over. Often considered the hidden gems of the universe, these dense, mysterious objects offer a fascinating glimpse into the extreme forces at work in the cosmos. If you're curious to discover what neutron stars are, how they form, and why they're essential to our understanding of the universe, you've come to the right place.
Neutron stars represent one of the final stages of stellar evolution, forming from the remains of a supernova, the explosion of a massive star. With an unimaginable density, where a simple sugar lump of matter could weigh as much as a mountain on Earth, these stars offer a unique field of study for the laws of physics under extreme conditions.
First discovered in the early 20th century, neutron stars have been the subject of intense research ever since. They are fascinating not only for what they reveal about the very nature of matter and space-time, but also for their role in spectacular astronomical phenomena such as pulsars and gravitational waves.
We'll delve into the mysteries of neutron stars, pulsars and magnetars, and their importance in our quest to understand the universe. Follow us on this journey through space to discover the secrets of neutron stars, those silent guardians of cosmic history.
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💥NEUTRON STARS:
- In 2018, astronomers discovered the first isolated neutron star outside the Milky Way. It was while observing the Small Magellanic Cloud, 200,000 light-years from our Sun, more precisely the remains of a supernova explosion that occurred there almost 2,000 years ago, that they detected it. This discovery was made possible by the use of advanced technology. By superimposing the X-rays captured by NASA's Chandra space telescope with the visible light observed by the MUSE instrument mounted on the European Southern Observatory's very large telescope in Chile, they were able to immortalize the remains of this cataclysmic event.
In this fabulous pocket of gas, named E 0102 and known for almost 35 years, they detected a second ring of gas. This one, much smaller in size, shelters a bright spot in X-rays: a neutron star. While the scientists weren't too surprised by their find, they were stunned by its characteristics. The star is surrounded by two gaseous rings, both highly asymmetrical and extending at different speeds. The main ring extends at a speed of around 1,000 km/s, while the smaller ring that houses the star has a speed of around 90 km/s.
Scientists are comparing the energy spectrum of this neutron star with that of two other well-known stars in our Galaxy. These are located in the supernova remnants Cassiopeia A in the constellation of the same name, and Puppis A in the constellation La Poupe, also unaccompanied by another star.
The star, detected only by its X-ray emissions, emits no radio emissions, pulsed or otherwise, indicating that its magnetic field is relatively weak. Of all the neutron stars discovered to date in the Milky Way, only 10 others display these same characteristics.
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🎬 On the program today:
- 00:00 - Introduction
- 02:06 - Origin of neutron stars
- 06:25 - Detection of neutron stars
- 10:53 - Discovery of an extragalactic neutron star
- 14:57 - Characteristics of a neutron star
- 24:55 - Magnetars
- 36:07 - Pulsars
- 42:15 - Atypical stars
- 45:52 - X-Binaries
- 49:51 - Double pulsar
- 54:02 - Pulsar planets
- 58:57 - Glitch
- 01:01:37 - Birth of a neutron star
- 01:04:11 - Collisions and mergers
- 01:10:54 - GW200105 and GW200115
- 01:13:45 - The magnificent 7
- 01:18:34 - Some disconcerting examples
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4 июн 2024
