Cosmology: A Big Bang and the Beginning of the Universe

If we want to learn about the universe, we have to start at the very beginning. How and when did the universe begin? Is it even possible to know about such things? Yes, it is! That's what cosmology is all about, the origin and development of the universe. Let's go over what astronomers know today, and also mention what we don't know yet!

Check out "Is This Wi-Fi Organic?", my book on disarming pseudoscience!

[mysterymaster_]

"how do we show nothingness"
use the "no background" checkered squares that png images use

[flirkami]

So this is a serious question, why in Professor Dave's sake are these Videos getting these low view counts? This content is not university level but all the videos are a good precurser to whichever field one wants to know more about and to get started. People should really appreciate such stuff way more ..

[ee]

1:48 ''in this tutorial''
thanks now i can make my own universe!

[tiuhti__]

The Big bang is such a weird thing to imagine. Especially T=0. Its so incredibly strange and for some reason I'm getting anxiety from it, because my mind can't comprehend it. Great Video!

[leekfam]

Imagine going to visit your relatives in the singularity and then your home is instantly light years away

[aaaah]

One of the things I like about science is that it’s a humble philosophy. When scientists don’t know things, they admit it outright to everyone. That way, we know what we need to learn in the future. It makes scientists trustworthy.

[alsilverman]

Wow PD. That was incredibly interesting. Sending this to my brother. At 71 he’s just retired a Dr of internal medicine, and going back to school to get his degree in Astronomy.

[michaelpisciarino]

0:29 How did The Universe Begin? When did it begin?
0:57 *The Big Bang*
 2:30 The Beginning, T= 0
3:20 Nothingness, how do we see nothingness?
4:02 t= 0, *The Uncaused Cause*
5:12 Some Energy from No Energy. The Simplest Thing (The Original Duality)

5:54 *10^-43 Seconds after The Big Bang* "The Planck Epoch"

7:24 10^-43 to 10^-36 Seconds, "The Grand Unification Epoch"

8:00 10^-36 to 10^-32 Seconds, "The Electro-Weak Epoch" or "The Inflationary Epoch"

Even dispersion

9:38 10^-12 Seconds, "The Quark Epoch"

10:00 10^-6, "The Hadron Epoch"

11:17 1-10 Seconds, "The Lepton Epoch"

11:40 10seconds- 17 minutes The Photon Epoch, Fusion, "The Big Bang Nucleosynthesis Period"

12:27 17 minutes to 337, 000 Years "The Photon Epoch Continued"

14:02 337, 000 years- 150 million years *The Dark Ages* not much happening
- Slow Slow Cooling
- Slow Slow collecting of gas clouds
- Atoms join together

[fireninjas]

Professor Dave, thanks for making your videos they are great. You're doing a great service to us english speakers teaching these scientific principles in such an understandable way.

Question about the last part of this video though, isnt oxygen required for ignition? Or was oxygen also one of the atoms created as part of the gases when fusion was possible?

[wowlukewalker]

After watching this video my grandmother turned to me with a confused look on her face and said, "You really believe all this stuff? This makes more sense to you than creationism?" Science education is much needed, thank you for this video Professor Dave!

[Hansca]

I've watched MANY youtube videos on this subject and this is by far the best. Dave you have an uncanny knack for teaching, thank you!!!

[luker]

This is amazing. I've never seen such a clear and concise explanation of complex phenomena that can be understood by a layperson like me. Well done sir.

[DudeWhoSaysDeez]

I like cosmology. This is a good explanation with good animations to help us understand.

[cgaccount]

I love the format of your videos. You cover these complex topics at a level that most people can understand and still make them entertaining.

[FrostDirt]

I haven't thought about how the universe can expand so quickly in such a short amount of time. But when I apply the time-dependence of the Hubble parameter for a radiation dominated universe ([d/dt a]/a = 1/2 1/t), everything makes sense lol.

[arsenic]

I love this so much. The sheer AWE of it. But it also terrifies me to my very core.... the idea of "nothing" is just so hard for me to not be afraid of. Irrational fear unfortunately.

[constpegasus]

You do some incredible explaining on your videos. Keep them coming!!!!

[matthewb]

You musings about "no thing, or is it some thing" reminds me of something we listened to occassionally in the missile business. "The missile knows where it is at all times. It knows this, because it knows where it isn't."

[WillPhil]

Professor Dave is so important to the world...

[lolod-b]

I just love how these tutorials are both accessible and deep down into the subject !