Is Alcyoneus Actually The LARGEST Galaxy In The Universe?
367What if the biggest galaxy in the universe… isn’t? In this video, we explore Alcyoneus, the radio galaxy whose jets stretch over 16 million light-years, making it possibly the largest known structure of galactic origin. But here’s the twist: its host galaxy is totally average, smaller than the Milky Way, with a supermassive black hole that’s nowhere near the size of IC 1101’s. So how did it produce radio jets so massive they dwarf entire galaxy clusters? We dive into LOFAR radio telescopes, intergalactic plasma, Fanaroff-Riley classifications, and cosmic filaments of the dark matter web to uncover why Alcyoneus shocked astronomers everywhere.
But does that make it the largest galaxy? Or just the galaxy with the biggest radio structure? We compare it to IC 1101, the Phoenix Cluster’s starburst monster, and Rubin’s Galaxy UGC 2885. We’ll look at how galaxies are measured, radio jets, stellar components, ultraviolet arms, infrared dust, and dark matter halos. And we’ll question what really defines the size of a galaxy in the first place. This isn't just a debate about scale, it's a peek into how astronomy still wrestles with definitions in a universe that's far from fully understood. Hit subscribe and get ready to challenge everything you thought you knew about the cosmos.
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Credits: Ron Miller, Mark A. Garlick / MarkGarlick.com ,Elon Musk/SpaceX/ Flickr
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00:00 Intro
2:40 Andromeda
3:06 Ic 1101, The Huge Galaxy
5:01 Hercules Galaxy, A- 1.5 Million Light Years
9:22 Phoenix Cluster galaxy - 2.2 Million Light Years
10:42 Constellation Lynx - 3.5 Billion Light Years
11:06 Alcyoneus Galaxy - The biggest one?
14:48 is it correct to define Alcyoneus the biggest galaxy?
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