Rethinking Reality: Space, Time and Gravity

With Sam Gralla. At the dawn of the twentieth century, Einstein revolutionized our conception of reality, showing that space and time are not merely the stage on which the show unfolds, but dynamical entities that stretch, bend, and vibrate to give rise to the force we know as gravity. A century later, the vibrations of spacetime have been directly detected as gravitational radiation from colliding black holes, confirming Einstein’s prediction and ushering in a new era in observational astronomy. How did physicists measure these minuscule vibrations, and what does it mean for our understanding of the universe? And what is the next revolution, fomenting right now, in our conception of space and time?

Part of the UA Science Lecture Series.

[genecat]

If science videos had their own award show, this one would win the Oscar. Enlightening, engaging and thoroughly entertaining. Thank you Prof. Gralla

[mrpaddingtonn]

this presenter, Sam, will go far in his career as a “science speaker”! the talk was very well constructed, presented, and delivered. kudos!

[paf]

This is an excellent public lecture on a very intricate subject that allows even an averagely witted person like me to get an idea of what the physics behind the universe is about. Thank you Prof Gralla. You are a gifted teacher.

[DarwinianUniversal]

A grade teacher. Special talent for creating clear and useful explanations

[furtadoyvonne]

Good presentation, was brought to the level where a layman could grasp the knowledge without stumbling on math equations.

[AlexeiRamotar]

Very good presentation. For those critiquing please realize this is a lecture for the general public not a scientific conference. Thank you for the upload.

[mrtonyadkins]

How is it that a good ole' boy from the hills of West Virginia understood this lecture? I suspect that he is an excellent professor.

[fungiuse]

One of the best lecture I've seen lately ... just as good as my Mom's lecturing me on how long I take to get ready for work!!

[cahenglish]

that guy was amazing what a communicator!

[simonreeves]

Whilst mainly listening to this lecture, I browsed through the comments and was amazed by the number of science deniers bashing Einstein. These people are using computer technology to make these comments; technology that is only possible because of the work of great intellects like Einstein and Tesla who laid the foundations for modern electronics to be possible at all. As an electronics engineer I understand the basics of electronics; PNP and NPN junctions on a silicon substrate. I studied in the 1980's when fibre optics was the new kid on the block, this technology is now the backbone of the modern Internet. I'm amazed at the arrogance of people who probably can't even fix a bicycle, let alone understand electronics, or even comprehend the concepts of Quantum Physics.

[paulmutter]

What a brilliant presentation and presenter. Lucky graduate and undergraduate students who get him as a teacher

[paxdriver]

That animation at 34 mins is phenomenal!

[whirledpeas]

I admire this kid, When I was 12 years old I was skateboarding not giving lectures on gravitational waves 🐸

[wjckc]

This talk is excellent. We have so-called scientific educators like Dr. Tyson and Dr. Kaku (sp?), spewing interdimensional this and that with fancy metaphors to a population who believes it wall based on authority. Dr. Sagan would be dismayed. This is super basic, thorough, and well done. This is the public science education that people should be receiving.

[OriginalXfyre]

When you breach the speed of sound, a sonic boom occurs, yet you can still hear your own voice... But light isnt a sound. Light is visual and no Boom (Supposedly). However, a visual boom may occur in opposition of light, thus visual distortion to our eyes. Objects flying toward a Black Hole will reach beyond the speed of light, thus become visually Distorted or gone by our visual perspective. But is it gone?

[kristypolymath]

This gentleman is VERY pleasant to listen to. Well done, though I'm not a scientist in the conventional sense.

[justintindall]

Not to know is different from wanting to know. Please may this information/knowledge get to those who want to know!

[viviennetobassa]

Great presentation, very well simplified and articulated. Gratitude.

[timeisapathwalkingtounderstand]

I've seen and listened to many videos on the explanation of space and time but this one here is going to be one of my favorites thank you for posting this video

[ubuenglish]

I gotta say that this is a great explanation, and the bit where you're shaking your fist and sending out gravitational waves was hilarious - why no one was cracking up is beyond me. I was LMAO!