The Solution to Olbers' Paradox
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- čas přidán 13. 06. 2024
- Olbers' Paradox asks the question of why the night sky is dark. This odd question leads us to some incredible understandings about the cosmos.
This is the second of the videos in my new series of Cosmology. I'm going through Dr. Barbara Ryden's textbook "Introduction to Cosmology". If you follow along, you'll get a full upper-division undergraduate course in Cosmology. I used this textbook at William Paterson University.
This course will cover the current state of the science of Cosmology. To follow along, it'll be a good idea for you to ge to know your calculus. Here are the topics of this video:
Introductory Cosmology
Chapter 02: Fundamental Observations
Section 01: What is Olbers' paradox?
Some things covered:
Where did it come from?
How is Copernicus involved with this?
Is the Universe infinite in extent?
Is the Universe infinitely old?
Why is Edgar Allan Poe so grumpy?
Textbook: / introduction-to-cosmology
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/ @jasonkendallastronomer - Věda a technologie
This channel is the gift that just keeps giving.
Fantastic presentation. Loved it! Looking forward to learning more.
Oh, you have also now sparked my curiosity to learn celestial navigation. You've got me thinking about spherical trigonometry! Great job.
Go for it!
I'm an ex Navigation Cadet. If you have any questions I'll try to help.😊
Is it from the acceleration of the expansion due to dark energy?
Comprehensive, thanks! Could you spell out sometime how photons losing momentum would result in a blurrier image? It’s kind of a side point for this topic, but it doesn’t seem obvious to me why it’s true.
Essentially if some of the photons traveling towards you were to slow down/scatter you would not see the object as it was
Here's an anecdote regarding seeing the stars from a new perspective. The first time I used a night vision scope on a clear night for search and rescue, I happened to glance up at the sky. There are countless stars in the darkness that become visible with some light amplification far more than are visible with the naked eye. It was utterly awe inspiring, and extremely tempting to keep looking, rather than the far more pressing issue of searching the water surface for a lost boat.
Hubble constant and big bang and relativity solves this nicely, but I will continue watching anyways.
Interesting, I shall watch the rest of the series. As a matter of interest, who or what is the figure laying face-down at 21:10 , and what is he/she doing there?
Thank you announcing that you are keeping the h_bar and c constants!! Finally!! Someone is keeping them in the equation!!🤣🤣🙌🏼🙌🏼👍🙌🏼
Not sure I don't see how this isn't simply "inverse square".
@Jason Kendall
Sir, with new mic you sould rerecord your previous video with bad voice sound.
They are all in the works... All the old videos were done with poor equipment, and with the intent to give my online students some sort of lecture to use that was relevant to the course. Now that this is full time, it's worth going back over everything and re-doing them all, in addition to creating this new cosmology course...
@@JasonKendallAstronomer Thank you for your work
get a bigger aperture and a more sensitive receptor. or use a more appropriate wavelength. if you see in microwave frequencies, the whole sky is lit up.
Ten to the seven etc, not seventh; unless you follow it with the word "power".
No need to thank me.😊
Good sober non clickbait video.
First
It's not dark, only to our eyes.
Err ... that's what 'dark' means.
Not sure how it's a paradox.
We are not emitting any light from earth and there is nothing for it to reflect off of
Light is emitted when electrons make a transition from a high energy state to a lower energy state. You emit light. This is about why light from stars isn't visible to us everywhere, it doesn't require something to reflect off of.
When the Moon is totally eclipsed by the Earth (a "deep eclipse"),[2][3] it takes on a reddish color that is caused by the planet when it completely blocks direct sunlight from reaching the Moon's surface, as the only light that is reflected from the lunar surface is what has been refracted by the Earth's atmosphere.
Heinrich Wilhelm Matthias Olbers….. who’s mister OLBER ?