How far is the edge of the universe?

Did you ever sit under the clear night sky and wonder “does it go on forever?" The size of the universe has long been a question that has puzzled scientists, philosophers, and theologians, without a clear answer… well, until now. In this video, Fermilab’s Dr. Don Lincoln leads you through what modern science can say about the size of the universe.

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[JavierArveloCruzSantana]

Does this channel pay YouTube NOT to interrupt the lecture?

Dr. Lincoln, it's always a pleasure to listen to your lessons.

[hamentaschen]

When my dog gets a treat from my left hand she was expecting to be in my right, it blows her little mind...completely.
That is what this video is doing to me! Thank you Dr. Don!

[dreadinside]

I wish this man was my science teacher when I was in high school. Now at the age of 40 I love listening to his presentation here in YouTube. It's so calming and informative at the same time. 😃

[rnnyhoff]

It is "mind-blowing" and in all rational aspects, seemingly inconceivable. Might as well be infinite if the visible universe is 92 billion light years in diameter but its actual size 250X that. Great video explained thoughtfully and clearly. Bravo Professor Lincoln!

[robbaskerville]

This guy is a really great presenter. One of the best on you tube. Whoever does the scripts does a great job as well.

[junfenggao]

"It's a complicated calculation but a straightforward one".


Not falling for that one again.

[davidlee]

My favorite part. We know this is true because we proved it. And six hundred years ago the earth was flat.

[benlonghair]

"Space is big. Really big. You just won’t believe how vastly hugely mindbogglingly big it is. I mean you may think it’s a long way down the road to the chemist’s, but that’s just peanuts to space." -Douglas Adams

[nowkentapplegate]

I really appreciate the style of these presentations. Very clear concise and "straight forward" Thank you Dr. Lincoln..

[yolandacroes]

I have been fascinated with space since I was a child. Unfortunately I’m physics and mathematically challenged. Thanks for making this awesome knowledge understandable for people like me.

[jhaychylla]

None of us will ever live, in this lifetime, to find out.

One of my favorite quotes by Douglas Adams:

> Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.

[bruinflight]

I try to measure how much I love this channel and keep coming up with infinities in my calculations! Please make more videos Dr. L! You're the BEST!

[CarolynFahm]

The entire video, the entire series, the entire Fermilab channel is fascinating, and we are so fortunate that you chose to share the fascination of physics with me and other physics aficionados.

[jexy_marshall]

It's a good thing that 13.8 billion years ago Cameramen were able to withstand 5, 400°f or we'd never be sure about the visibility.

[Leo-ebwl]

When you consider that the furthest man has been from earth is just 1.3 light seconds... Blows my mind

[Sesso]

I can watch these videos over and over cause Ill never really grasp the grandiosity of it, lol. Its just mindbending, that humans are capable of such feats. Thanks Mr Lincoln for the great moderation. :)

[coevad]

I’ve watched maybe 6-7 videos of this person. So far this is the best one, because it’s the most comprehensible one, the others not so much.

[ivanlandivar]

What a good explanation. Space, physics, astronomy, all they are fascinating.

[bcflyer]

Don Lincoln knows how to explain the complicated in simple and visual terms. He's brilliant and I love his videos.