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V404 Cygni
Manage episode 478546779 series 178791
Content provided by McDonald Observatory and Billy Henry. All podcast content including episodes, graphics, and podcast descriptions are uploaded and provided directly by McDonald Observatory and Billy Henry or their podcast platform partner. If you believe someone is using your copyrighted work without your permission, you can follow the process outlined here https://staging.podcastplayer.com/legal.
The story of a black hole in Cygnus, the swan, is like the tale of an angler – there’s the star it caught, and the one that got away.
V404 Cygni is about 7800 light-years away. It appears fairly close to the star that marks the intersection of the swan’s body and wings, which is high in the sky at dawn.
The system was first noticed in 1938, when it flared up – a performance it’s repeated several times.
Later, it was discovered that V404 Cygni is a tight binary: a black hole about nine times the mass of the Sun, plus a “normal” star a little less massive than the Sun.
The black hole is pulling gas from the companion. The gas forms a disk around the black hole. Every couple of decades, so much gas piles up that it sets off an explosion. That makes the system shine thousands of times brighter.
Recently, astronomers found that what looked like a background star probably is bound to the other two. It’s more than 300 billion miles from them. It’s bigger and heavier than the Sun, and is puffing up to become a giant.
This third star is about four billion years old – suggesting that the black hole is also that old. The black hole is the corpse of a massive star. Most such stars explode, hurling away any companions. This star must have collapsed completely, without exploding. Since then, it’s consumed at least half of its close companion – but the distant one got away.
Script by Damond Benningfield
2843 episodes
Share
Manage episode 478546779 series 178791
Content provided by McDonald Observatory and Billy Henry. All podcast content including episodes, graphics, and podcast descriptions are uploaded and provided directly by McDonald Observatory and Billy Henry or their podcast platform partner. If you believe someone is using your copyrighted work without your permission, you can follow the process outlined here https://staging.podcastplayer.com/legal.
The story of a black hole in Cygnus, the swan, is like the tale of an angler – there’s the star it caught, and the one that got away.
V404 Cygni is about 7800 light-years away. It appears fairly close to the star that marks the intersection of the swan’s body and wings, which is high in the sky at dawn.
The system was first noticed in 1938, when it flared up – a performance it’s repeated several times.
Later, it was discovered that V404 Cygni is a tight binary: a black hole about nine times the mass of the Sun, plus a “normal” star a little less massive than the Sun.
The black hole is pulling gas from the companion. The gas forms a disk around the black hole. Every couple of decades, so much gas piles up that it sets off an explosion. That makes the system shine thousands of times brighter.
Recently, astronomers found that what looked like a background star probably is bound to the other two. It’s more than 300 billion miles from them. It’s bigger and heavier than the Sun, and is puffing up to become a giant.
This third star is about four billion years old – suggesting that the black hole is also that old. The black hole is the corpse of a massive star. Most such stars explode, hurling away any companions. This star must have collapsed completely, without exploding. Since then, it’s consumed at least half of its close companion – but the distant one got away.
Script by Damond Benningfield
2843 episodes
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Similar to StarDate
This Week in Evolution is a podcast on the biology of what makes us tick. Hosts Nels Elde and Vincent Racaniello take you through the new evolution that has been revolutionized by the field of genomics and molecular biology.
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…
continue reading
The Science Show gives Australians unique insights into the latest scientific research and debate, from the physics of cricket to prime ministerial biorhythms.
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continue reading
Scientists Daniel and Kelly cannot stop talking about our amazing, wonderful, weird Universe! Each episode is a fun, easy-to-understand, and in-depth explanation of topics in science, from particles to black holes to moon colonies to ecosystems to parasites and everything else in the Universe!
…
continue reading
Take a fact-based journey through the cosmos. Tune in to hear weekly discussions on astronomical topics ranging from planets to cosmology. Hosted by Fraser Cain (Universe Today) and Dr. Pamela L. Gay (Planetary Science Institute), this show brings the questions of an avid astronomy lover direct to an astronomer. Together Fraser and Pamela explore what is known and being discovered about the universe around us. Astronomy Cast is supported thru patreon.com/AstronomyCast.
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I discuss a variety of topics in both the natural and social sciences, exploring the many fascinating insights that the scientific method yields about the world around us.
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Emergency Medicine Cases – Where the Experts Keep You in the Know. For show notes, quizzes, videos and more learning tools please visit emergencymedicinecases.com
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