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The Mystery Of The Oh My God Particle | Answers With Joe
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On October 15th 1991, astronomers recorded a cosmic ray that was moving faster than should be possible - and despite the fact they've found a whole lot since, they have no idea where they come from.
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Cosmic ray shatter animation - Sean Quinn
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TRANSCRIPT:
From 1983 to 1991 on the Dugway Proving Ground in Utah, an experiment had been under way by the University of Utah called the Fly’s Eye Cosmic Ray Detector.
And this is how they found the Oh My God particle, but before I explain it, let me back up and talk about cosmic rays so you can fully grasp the Oh My God reaction here.
Cosmic rays are mostly made up of the nuclei of atoms, 90% of them are single protons - the nuclei of hydrogen atoms. These are much higher energy than solar radiation because unlike photons they actually have mass.
This was the first ultra-high energy cosmic ray discovered, which was shocking not just because of it had a lot of energy, but because it kind-of shouldn’t have been possible thanks to something called the GZK cutoff.
GZK stands for the scientists Kenneth Greisen, Georgie Zatsepin and Vadim Kuzmin, who set a speed limit for cosmic rays at 5 x 10 to the 19th electron volts, or 8 joules of energy. It was believed that particles couldn’t exceed this limit due to interactions with photons in the microwave background radiation.
This new class of cosmic rays became known as trans-GZK cosmic rays. They are super rare and believed to be from fairly close by in order to have that kind of speed - the less they’ve travelled, the less they would be slowed down by the CMB.
Since discovering the OMG particle, there have been a slew of new cosmic ray observatories like the Pierre Auger observatory and the Telescope Array Project, which is the successor to the fly’s eye.
There have also been efforts to focus on high-energy neutrinos with the belief that they may be created in a similar process to the high-energy cosmic rays. There’s an observatory underneath the south pole that specializes in that.
Support me on Patreon!
Follow me at all my places!
===============
LINKS LINKS LINKS:
Cosmic ray shatter animation - Sean Quinn
=================
TRANSCRIPT:
From 1983 to 1991 on the Dugway Proving Ground in Utah, an experiment had been under way by the University of Utah called the Fly’s Eye Cosmic Ray Detector.
And this is how they found the Oh My God particle, but before I explain it, let me back up and talk about cosmic rays so you can fully grasp the Oh My God reaction here.
Cosmic rays are mostly made up of the nuclei of atoms, 90% of them are single protons - the nuclei of hydrogen atoms. These are much higher energy than solar radiation because unlike photons they actually have mass.
This was the first ultra-high energy cosmic ray discovered, which was shocking not just because of it had a lot of energy, but because it kind-of shouldn’t have been possible thanks to something called the GZK cutoff.
GZK stands for the scientists Kenneth Greisen, Georgie Zatsepin and Vadim Kuzmin, who set a speed limit for cosmic rays at 5 x 10 to the 19th electron volts, or 8 joules of energy. It was believed that particles couldn’t exceed this limit due to interactions with photons in the microwave background radiation.
This new class of cosmic rays became known as trans-GZK cosmic rays. They are super rare and believed to be from fairly close by in order to have that kind of speed - the less they’ve travelled, the less they would be slowed down by the CMB.
Since discovering the OMG particle, there have been a slew of new cosmic ray observatories like the Pierre Auger observatory and the Telescope Array Project, which is the successor to the fly’s eye.
There have also been efforts to focus on high-energy neutrinos with the belief that they may be created in a similar process to the high-energy cosmic rays. There’s an observatory underneath the south pole that specializes in that.
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