'Probing the Dark Universe' - A Lecture by Dr. Josh Frieman

In this one-hour public lecture Josh Frieman, director of the Dark Energy Survey, presents an overview of our current knowledge of the universe and describe new experiments and observatories. Over the last two decades cosmologists have made remarkable discoveries: Only 4 percent of our universe is made of ordinary matter - atoms, molecules, etc. The other 96 percent is dark, in forms unlike anything with which we are familiar. About 25 percent is dark matter, which holds galaxies and larger-scale structures together and may be a new elementary particle. And 70 percent is thought to be dark energy, an even more mysterious entity which speeds up the expansion of the universe. Josh Frieman is senior staff scientist at the Fermilab and Professor of Astronomy and Astrophysics and member of the Kavli Institute for Cosmological Physics at the University of Chicago. The Dark Energy Survey is a collaboration of 300 scientists from 25 institutions on 3 continents, which built and uses a powerful 570-Megapixel camera on a telescope in Chile to carry out a 5-year survey of 300 million galaxies and thousands of supernovae to probe dark energy and the origin of cosmic acceleration.

[tannerbeverley]

I fell asleep and this is what was on when I woke up

[Livenewme]

I fell asleep watching vsause and ended up here

[Machistmo]

Fell asleep watching Wonderful Person and woke up here.

A guy in my dream was trying to sell me a car and he kept saying ‘because gravity is attractive, so is this car’

[seabreez]

I love how everyone fell asleep and woke up to this.😂 I literally woke up with about 20 minutes left of this guy's lecture. So I guess you can say I watched it all.

[sinisterone]

I fell asleep and woke up here after having an amazing vivid dream about stars, galaxies, clusters and the like, WOW super trippy this guy narrated my dream

[augustosilveira]

Congratulations to the producers, who were mindful of the needs of the remote audience (via YouTube, etc).They made sure that we saw the slides and heard the audience questions just as clearly as the auditorium attendees.

[johnbeam]

Yes indeed I fell asleep and this was on.

[AnkushJainbl]

Why so much hate in comments? I find it informative. My nephew wants to be a astrophysicist. He finds it very useful. Thanx.

[markverheul]

I’ve seen this video before and always thought everyone was trolling but I literally fell asleep last night watching something else and now I woke up and this was on

[mygoldfishranaway]

I have passed out watching various space themed videos a dozen times and always end up here. This is it. This is the space video boys. It’s probably entirely recorded in my subconscious by now.

[thomastakeshita]

Anyone else fall asleep and wake up here?

[Souldamnation]

No matter what i decide to have on in the background before i sleep, autoplay always directs me to this around the time i wake up.

[OofCurator]

It's so bizarre how YouTube has chosen to provide this video to our sleeping subconscious. I woke up to this too, then read the comments about so many people waking up to this playing, and that's when I even realized that I woke up to it too and was really freaked out. But now I put this on as I'm laying in bed trying to go to sleep. That's called a checkmate, YouTube.

[OofCurator]

YouTube literally plays this video every time I go to sleep. It's the only video that YouTube knows I've already watched that YouTube autoplays for me and it does this every night!

[kittengamer]

...i'm so confused I feel asleep watching something and I wake up to this

[michaelmcconnell]

I've watched this several times. I've liked it, I've disliked it, I've commented, I've told YouTube "stop showing me this", and it still comes up on my recommends EVERY SINGLE DAY.

[Soupy_loopy]

Holy crap, I guess you tube is pushing this video to everyone in their sleep.

[jspin]

So we've known about dark matter for about 80 years or so and we still have no freaking clue what it is?! Awesome. I'm on it.

[aborawk]

I swear every time I wake up anymore I see a long ass space related video. Every morning, without fail, for like a month now. No matter what I fell asleep watching.

[skuddingomcwinters]

I fell asleep listening to this and dreamt I was a secret agent transporting an astrophysicist to a new telescope in Chile while an underground evil organization was trying to kidnap him and he was explaining vacuum energy along the way. Awesome dream, good job brain.