ARE THERE MORE THAN 1 UNIVERSE??

WHAT IS A NEUTRINO??

Blog#123

Wednesday, September 15th, 2021

Welcome back,

Neutrinos are elusive subatomic particles created in a wide variety of nuclear processes. Their name, which means “little neutral one,” refers to the fact that they carry no electrical charge. Of the four fundamental forces in the universe, neutrinos only interact with two — gravity and the weak force, which is responsible for the radioactive decay of atoms. Having nearly no mass, they zip through the cosmos at almost the speed of light.

Countless neutrinos came into existence fractions of a second after the Big Bang. And new neutrinos are created all the time: in the nuclear hearts of stars, in particle accelerators and atomic reactors on Earth, during the explosive collapse of supernovas and when radioactive elements decay. This means that there are, on average, 1 billion times more neutrinos than protons in the universe, according to physicist Karsten Heeger of Yale University in New Haven, Connecticut.

Despite their ubiquity, neutrinos largely remain a mystery to physicists because the particles are so tough to catch. Neutrinos stream through most matter as if they were light rays going through a transparent window, scarcely interacting with everything else in existence. Approximately 100 billion neutrinos are passing through every square centimeter of your body at this moment, though you won’t feel a thing.

Neutrinos were first posited as the answer to a scientific enigma. In the late 19th century, researchers were puzzling over a phenomenon known as beta decay, in which the nucleus inside an atom spontaneously emits an electron. Beta decay seemed to violate two fundamental physical laws: conservation of energy and conservation of momentum. In beta decay, the final configuration of particles seemed to have slightly too little energy, and the proton was standing still rather than being knocked in the opposite direction of the electron. It wasn’t until 1930 that physicist Wolfgang Pauli proposed the idea that an extra particle might be flying out of the nucleus, carrying with it the missing energy and momentum.

“I have done a terrible thing. I have postulated a particle that cannot be detected,“ Pauli said to a friend, referring to the fact that his hypothesized neutrino was so ghostly that it would barely interact with anything and would have little to no mass.

More than a quarter century later, physicists Clyde Cowan and Frederick Reines built a neutrino detector and placed it outside the nuclear reactor at the atomic Savannah River power plant in South Carolina. Their experiment managed to snag a few of the hundreds of trillions of neutrinos that were flying from the reactor, and Cowan and Reines proudly sent Pauli a telegram to inform him of their confirmation. Reines would go on to win the Nobel Prize in Physics in 1995 — by which time, Cowan had died.

But since then, neutrinos have continually defied scientists’ expectations.

The sun produces colossal numbers of neutrinos that bombard the Earth. In the mid-20th century, researchers built detectors to search for these neutrinos, but their experiments kept showing a discrepancy, detecting only about one-third of the neutrinos that had been predicted. Either something was wrong with astronomers’ models of the sun, or something strange was going on.

Physicists eventually realized that neutrinos likely come in three different flavors, or types. The ordinary neutrino is called the electron neutrino, but two other flavors also exist: a muon neutrino and a tau neutrino. 

As they pass through the distance between the sun and our planet, neutrinos are oscillating between these three types, which is why those early experiments — which had only been designed to search for one flavor — kept missing two-thirds of their total number.

But only particles that have mass can undergo this oscillation, contradicting earlier ideas that neutrinos were massless. While scientists still don’t know the exact masses of all three neutrinos, experiments have determined that the heaviest of them must be at least 0.0000059 times smaller than the mass of the electron.

SOURCE: www.livescience.com

COMING UP!!

(Saturday, September 18th , 2021)

“DO WE LIVE IN A FALSE VACUUM??”

A philosopher once asked, "Are we human because we gaze at the stars, or do we gaze at them because we are human?" Pointless, really..."Do the stars gaze back?" Now, that's a question.

- Neil Gaiman, Stardust

What that James Webb image really means. Full video here:

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Supernovas, Nebulas, and Stars captured by Hubble space telescope ✨🌌 💫

if you ever feel like you're not "smart enough" for STEM or didn't do that great in school, i just wanna let you know that i failed algebra 2 THREE TIMES and dropped my high school physics class the FIRST WEEK...

and NASA chose me to student research with them.

so what i'm trying to say is that STEM is for EVERYONE. if school wasn't the easiest for you and you're not the strongest in math, don't let that stop you from pursuing STEM. working hard for goals makes you a great scientist.

screw that stereotype that all STEM majors are geniuses who were building robots and knew how to work a microscope at 3 years old.

STEM IS FOR EVERYONE! BECOME A FREAKING SCIENTIST! YOU CAN DO IT!

NGC 1512 by NASA's James Webb Space Telescope

me: majored in aerospace engineering to hopefully design rovers that go to other planets to perform little science experiments and find rocks

my classmates: i want to create missiles and advanced war weaponry for the military

me: