Big Bang Gravitational Waves, Dark Matter & Why No Aliens? @DrBrianKeating Explains @ArvinAsh

Arvin Ash | Big Bang Gravitational Waves, Dark Matter & Why No Aliens? @DrBrianKeating Explains @ArvinAsh | Uploaded 2 years ago | Updated 4 hours ago
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Brian's YouTube Channel: youtube.com/c/DrBrianKeating
Brian's books on Amazon: tinyurl.com/25pptnqp
Brian's Wikipedia page: en.wikipedia.org/wiki/Brian_Keating
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SUMMARY::
This video is about 1) How Gravitational Waves from the Cosmic Microwave Background could solve the deepest mysteries of the Big Bang. Could the CMB solve the enigma that is the Big Bang? 2) What are the current best contenders for what Dark Matter is? 3) Why there may be no aliens! I interviewed Professor Brian Keating.

Brian Keating is an experimental cosmologist and Distinguished professor of Physics at the University of California, San Diego. He has written two books, one audio book, and hosts his own podcast. He is also a fellow YouTuber!

Brian's specialty is the Cosmic Microwave Background (CMB), in particular, he studies the polarization of the CMB. I interviewed him recently where we talked about the fascinating possibility of detecting gravitational waves from the polarization of the CMB. If we can do this, it will give us incredible insights into the earliest moments of the Big Bang revealing some of its mysteries, or perhaps even giving us a clue about its origins!

Brian also talked about the current best ideas about what Dark Matter could really be. And Brian has a surprisingly strong opinion about Aliens.
#briankeating
#cmb

VIDEO AND IMAGE CREDITS:
CMB polarization image by Robert Caldwell: researchgate.net/figure/The-temperature-and-curl-component-of-the-CMB-polarization-pattern-produced-by-a-single_fig1_1840218
NASA.gov
CMB Polarization image: https://lweb.cfa.harvard.edu/~cbischoff/cmb/
James Webb Space Telescope (JWST) Youtube channel
Digital Photography Review: DPReview.com
Some JWST animations courtesy of Northrup Grumman Youtube channel
Some JWST animations courtesy of Kevin Hainline Youtube channel

CHAPTERS:
0:00 Intro to Brian Keating and my embarrassment
1:43 What is the CMB?
2:37 What is the Polarization of the CMB?
5:34 What is the evidence for Cosmic Inflation?
6:22 What is the leading contender for Dark matter?
12:56 There may be no other life in the Universe!
18:34 Brian's free giveaway for Arvin Ash viewers

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$How the James Webb Space Telescope JWST Actually works! Signup for your FREE trial to Wondrium here: http://ow.ly/r72030smywp RESOURCES: Latest JWST Images: https://www.nasa.gov/mission_pages/webb/main/index.html Graphics of JWST: https://tinyurl.com/y64twaol NASA JWST explanation: https://tinyurl.com/2zt4nn7m Infrared vs visible light: https://tinyurl.com/2qs4tle4 First images from JWST: https://tinyurl.com/ybv2cohd Comprehensive info on JWST: https://tinyurl.com/y2jd7gwy CHAPTERS: 0:00 Intro Hubble vs JWST 1:38 JWST is just a digital camera! 6:25 Why Infrared is better than visible light 7:34 Instruments of the JWST 8:12 Why is Hubble located so far away? 10:12 How JWST protects itself from the sun 11:19 What will JWST see? 13:30 How to learn more about Astronomy SUMMARY: In 2021, we launched a space telescope thats 100 times more powerful than Hubble, called the James Webb Space Telescope. How does the JWST work? What makes it so powerful? And what might it see? A space telescope is basically a digital camera, except is that its more powerful and is built to take pictures of things very far away. To take any digital picture you need light, optics, and a sensor or recording device. The latter records the light. Its made of millions of small pixels, which are the smallest element of the sensor that can interact with light to produce a current. The amount of light absorbed by the pixel determines its brightness intensity. Since distant objects are very faint, space telescopes are designed to gather as much light as possible. This means that the JWST is designed with the largest folding mirror that would fit in a rocket (6.5 meters diameter vs Hubbles 2.4 m), and can have high exposure times. The JWST can capture more than 6.5 times more light than Hubble. And its designed to see infrared light, which is why its primary mirror is gold, since gold reflects infrared light better. Infrared has many advantages, like seeing through space dust better, and can observe things farther away and farther back in time, because the most distant objects are red shifted into infrared due to the expansion of the universe. How it works: Infrared Light travels through space, hits the telescopes primary mirror. Its reflected onto the smaller secondary mirror then into what’s called the Aft-Optics System, which focuses and refracts the light before it goes onto the sensors (or cameras) located behind the mirrors. Another difference between the JWST and Hubble is that it orbits the sun at about 1.5 million km away from earth instead of 547 km. Hubble orbiting so close to the earth leads to problems such as being in earths shadow for long periods, or overexposure due to the sun. Instead of orbiting the earth, JWST orbits the sun at the the L2 or second Lagrange point. Lagrange points are special points in space, where gravity from the sun and earth perfectly balances the orbital motion of a satellite so that it stays put in a stable orbit without using much energy. To prevent overexposure to the sun, JWST has a large sunshield protecting it from the suns rays, like a sun shade in your car. We expect the JWST to see objects and light from some of the earliest history of the universe, including the formation of the first stars and galaxies. The images should be even sharper and higher resolution than Hubble not only because of the bigger mirror, but also because the JWST uses more modern and advanced instruments. For example, the camera design uses mercury cadmium telluride. Its a crystal, grown in a lab that can convert infrared light into electricity directly. #jwst #jameswebbspacetelescope There is also a spectrometer on the telescope allowing us to detect that different atoms and molecules on distant planets. By looking for things like water, oxygen, methane and ammonia we may be able to detect life on exoplanets. a chance we might see something that looks like life. Yes, the JWST could detect possible alien life.$

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