Space Fan News #50: How Much Dark Energy Is There Really?; NASA Will Launch NuSTAR

[dornkrull22]

you are all to smart with the sound debate.if I could wrap my little noodle around it all I would die happy-lol

[n2motocross]

If they ever have an opening on the T.V. series 'Big Bang Theory'.,,,He will be a shoe-in.

Great video by the way.

[saultube44]

Thx for the video, is the short & comprehensive version of the latest astronomical discoveries. Thumbs up.

[rev0lut10nz]

Thanks for the great vid.

[1maN008]

565 likes and 0 dislikes... This shows how amazing your video is!

[coondiggity]

Though I'm a number of days late, I want to thank tdarnell for this video. I was JUST thinking about universal expansion and alleged dark energy, and pointing out a measured difference between the background radiation thinger and the thinger imaging the universe (I'm not sciencey, btw) explained it enough that I don't question intelligent men any more.

[1Hydraulic1]

dark energy is heard to be unseen and undetected, how can you really tell it exists? I have learned that dark energy was made up because astronomers found that the galaxies had too much matter more than what there was in it

[L00NGB00W]

@1Hydraulic1 That's Dark Matter you're referring to.

We can't observe it directly, but we can observe dark matter's gravitational effects on light waves.

Dark Energy is the stuff causing the universe to expand. I personally think that it consists of electrical interactions between virtual particles in intergalactic space.

Visible objects = 4% of the universe's mass.

Dark Matter = 23% of UM.

Dark Energy = 72% of UM.

[phuturephunk]

Right on!

[sniped101]

how do we know dark matter and dark energy exists?

[terr547]

Thank you! That is so annoying when people say nucular!

[pownderful]

DAMN hes got some nice antiques behind him the sign....oh fuck my ADHD

[dogmiagy]

thans for your videos, sir

=)

[Battery9876]

yeah but it says in the old testament that it's nucular lol

[Alienalloy]

..always a pleasure...never a chore ...

[TheBuckers2000]

Tony I love your videos very educational, can you tell us about IC 1101 I'm very iterated in the huge galaxy !

[Timmy123412]

I am proud to be the 500th like :)

[gjsterp]

Obviously the dark matter is god.

Have scientists determined whether it was the big bang that causes the expansion (pushing the universe) or dark matter (pulling the universe)?

[blahmcblahblah]

So we don't know about 73%, +/- 2% of the universe? Or do we add dark matter to that too? Love your shows man! They're informative and entertaining! More to the point, they're just like downtown!

[argh523]

@blahmcblahblah Dark Matter is in the other 27%, and makes up about 80% of it.

[RickyChitarrone]

Thanks so much for posting your bulletins. I have looked forward to watching them every weekend since I first subscribed.

[garion21]

I think I found my new favorite YouTube Subscription!

[Peggenhetti]

Ep 50, Just like downtown!

[dvaplustripet]

The Best*

[MindLessWiz]

Awesome! I'm really psyched about the dark energy measurement!

An error of only 2% is really incredible. I'm really happy about this.

Also looking forward to the x-ray images. I hope we get to see a little more detail than we can currently observe.

[cipher2]

I heard there was no sound in space, if so then how can we study sound waves?  Clarification on this much appreciated, please respond.

[somthinjustaintright]

@cipher2 I don't understand the concept of sound in space either !?!? I saw your post and waited a week. Maybe sound has more than one definition, like "nothing."

[pseudorandomly]

@somthinjustaintright

In the broadest definition, "sound" is just a pressure wave in matter. Pressure waves in air are what your ear perceives as speech, music, and other noise. Pressure waves in the Earth are what shakes the ground in earthquakes. Pressure waves in the ultrathin gas of interstellar space can trigger star formation. Pressure waves in the early Universe caused the slight temperature variations of the cosmic microwave background. All "sound" in the largest sense.

[somthinjustaintright]

@pseudorandomly Right, but how can sound waves travel through a "cloud" of, e.g. the Helium, through which our solar system is passing. There is less than one atom per cubic meter. I might have the numbers a bit skewed but I think the idea works. Thanks

[pseudorandomly]

@somthinjustaintright

In air at Earth-atmosphere pressure, you can produce a "sound" wave by simply waving your hand back and forth. The frequency is too low for your ear to perceive, but it is nonetheless very low-frequency "sound". The principle works in extremely low-density gas, too, just as in your example -- you just need a much bigger paddle than your hand to get a pressure wave started.

[ReaverStone]

@cipher2 It's wrong to say that there is no sound in space. Sound waves are able to move on earth because of the mediums it provides (air, water etc.) That equals to density, but there is no such medium in space to propagate the sound waves, so it can't be heard by our ears because we rely on pressure to hear a sound.

[Mallaclllypse]

@cipher2 @somthinjustaintright if you look at the map at 3:18 (CMB) it shows the distribution of matter in the universe when it was only about 380´000 years old. At this point the universe had no stars or galaxies, but instead was a hot, dense cloud of plasma that was dense enough to allow shockwaves to travel through it. Just like sound does here on earth or in the oceans.So they are not measuring sound travelling to us, but the effect of the shockwaves interacting with the plasma.

[cipher2]

@Mallaclllypse Thank you for taking the time to explain. I understand now, wheeeeeew!!!!

[006JoeS]

did you do a blopper of your blooper, without creating a blooper blooper reel? ahhhhh! thats more confusing than Giant quantum entanglment between galaxies.. :o...

[Bocbo]

This is one of the best episodes yet.

[sakitakono]

Amazing!

[diane3cats]

Many thanks for making these videos! I've learned a lot!

[TheHunnyhillbees]

These videos are truly brilliant - thank you. Happy 50th

[jamebozo]

And congratulations on your 50th space fan news video!!!!

[jamebozo]

awesome!! thank you for your video!!!!

[SlamaJamaSwag]

cool story bro....

[kshackleton]

I have a question. How does DE relate to the Standard Model and the 4 forces described in that model? Is DE something that sits outside that model?

[haiguizeify]

@kshackleton DE is outside of the standard model. It's a term used to describe the nature of whatever is causing the universe to expand at an accelerating rate. Think of it as the cosmological constant :)

[kshackleton]

@haiguizeify

Thanks, I suspected as much. I would also assume that DM is outside the standard model as well? It seems from the evidence that something with mass is actually there, but has no interaction at all with electromagnetism.

[haiguizeify]

@kshackleton It's hard to say. At the moment it's technically outside the standard model, but perhaps our experiements can shed some "light" on the subject (pun intended). Current experiments are designed to learn more about dark matter, I believe RICE and ANITA are the names of them. They're designed to detect neutrinos and analyze their behavior based off of the radio signals emitted when colliding with water molecules in the polar ice sheets. The answers are in the fast lane :)

[NICOLECALDERERO61]

i love watching Tony Darnell's videos about updates on astronomy, physics and downtown...

[bdsf1]

Ah, numbers. I like these..

Hubble Deep Field: The Most Imp. Image Ever Taken (Redux)

views 2,475,962

10,077 likes, 190 dislikes

Your 98.115 % star

[Kalohuxify]

Awesome channel, thank you.

[TooMuchForIt]

He's soft today :(

[husnainanwaar1992]

great job but make your videos like you used to, like this one [Hubble Deep Field: The Most Imp. Image Ever Taken (Redux)] it had almost 2.5 million views

[bdsf1]

" Just like downtown."

Now you city slickers turn those lights off, we're trying to see here.

:o)

[acidspittingdemon]

great job, as always!

[d3008]

thanks for another great video today!

[PushMyCarr]

Hey Tony, where is the centre of the universe? (I've heard it doesn't have one, but how come?)

[Films4You]

@PushMyCarr Blow up a balloon, half way put, some dots on it (One is our solar System).

Now blow the balloon up some more... sell how things move away from each other... but not center

[PushMyCarr]

@Films4You Thank you. When you put it that way, it makes more sense. :) Cheers!

[questionsleadtotruth]

Please keep the bloopers for future episodes. That's a great touch!

[questionsleadtotruth]

Brilliant video Tony. Thanks for enlightening us. :D

[8WholeThing]

Thank you for making these videos. That's the best explanation of dark energy yet. I've always been interested in astronomy as well as other sciences and history. You are filling in many gaps in my knowledge which takes my understanding, appreciation, awe and enjoyment to another level. Please keep up the good work.

[ogurth]

thanks! another great video!

[robbiethewood]

wow that's amazing 

[mgthaking]

And they say wr alone HA HA!!!!!

[megamarsvin]

@mgthaking Humans always like to think they're somehow special or unique ^^

[kenny8331]

Does SDSS factor in where these galaxies on the outer edge would be today? If not; why isn't that important?

[megamarsvin]

@kenny8331 I don't really know but I imagine we can't predict where they are today.

The number of forces that will have worked on them over millions or even billions of years would likely be hard to project, not to mention there are probably many out that far that we don't even know about.

Would love to be corrected if I'm wrong though :D

[mgthaking]

Thanks!!!!!!

[Vadalez8]

Congragulations on Space Fan News 50! Your videos have done a lot to enlighten me and spark my imagination time and time again. Thank you and heres to Fifty more!

[RRando17]

Very nice!

[Mallus01]

I dont get what matter is?

[ricois3]

@Mallus01 Neither do cosmologists! They know it's there but they dont really know what it is.

[TODIALAS2012]

I got to ask Carl Sagan about dark matter in the universe back in the early 90's He said "good question," I was so excited about meeting him, I couldn't tell you what he said after that. :)

[roargronmo]

What happen if we mixup matter and matter? It just disappear ?

[bicnarok]

Excellent info as usual. A bit confused mind, I read somewhere that 90 odd % of the universe is dark matter, now you mention that 74% is dark energy, well in my book that adds up to over 100% which not only leaves no room for us, but seems a bit too much to fit into the bubble.

[whereismymind1992]

@bicnarok A universe is made up 72% of dark energy and 27% of dark matter, rest is made of intergalactic gas (3.6%) and of stars (0.4%). Hope that helped clear things up :)

[AbusiveRogue]

@whereismymind1992 Now, my maths maybe a bit rusty since I finished highschool some 6 years ago (and we all know that's where you use maths the most)... But 72+27 from what I can recall equals 99, which makes it very tough for the other 4% you mentioned to fit into the whole % calculation. Unless ofcourse you're Russian and you get a to go up to 140%. But if my maths isn't failing me, you're adding up to 103%... Just saying.

[XxVassilisxX]

@AbusiveRogue When dealing in approximations that include margins of error, you don't include the error as part of the whole. i.e. if the approximate percentage of dark energy that has been measured is 72% +/- 2%, then the remainder follows the same margin of error so you would have 28% +/- 2%. The error margin just describes a fraction of each main part, that could statistically belong to either side.

[whereismymind1992]

@AbusiveRogue Sorry, that was a typo on my behalf, I meant 22%. (22.7% to be precise, so when I started typing I got distracted and typed 27%) Instead of trying to help you, I confused you even more :D Sorry!

[bicnarok]

@whereismymind1992 not really, on wiki for example it states "Dark matter is believed to constitute 83% of the matter in the universe and 23% of the mass-energy", other sites and books I have read have different % so I suppose It's all educated guessing anyway.

[pseudorandomly]

@bicnarok

These are difficult measurements, and, as all experiments, subject to certain levels of experimental error. Also, different methodologies are used, which may lead to somewhat different results. Dark matter is clumpy, so observations that measure dark matter and then calculate averages will not surprisingly lead to numbers that are a bit different than, say, calculating values from the slight anisotropy in the cosmic microwave background. By no means are these "guesses".

[Darkshadow7827]

I knew dark matter existed but this is the first time I've heard of dark energy. Quite a hard concept to wrap my head around considering I'm just an average joe with no background in astronomy at all. Appreciate the info! I learn something new every day!

[SPECTRE1961]

From Brazil ... Thanks, Indeed !

[ucigucimuci]

Thanks Tony, for yet another nice educational video...You are indeed getting really good at this.

[badwolfmusic]

when comparing the current map with the microwave background ... how do they distinguish between acoustic oscillations and everything else?

[Hankextreme]

Finally someone who uses it's knowledge to help us understand the facts easier, not just present us the raw facts.

[SuperJimbojames]

Can't wait for the next fifty!!!

[TotalImplosion]

There is no such thing as dark matter. You need to study the work of Nassim Haramein. This is a good place to start  playlist?list=PL8584652C3A0157­05&feature=view_all

[c3llyc3ll1]

Yaaa! Number 50 great job tony u r awesome we all learn so much from u. How u say keep looking up why we say keep them comeing

[Cocoshunt]

Some amount of Awe this week!

[krissus123]

Thanks for the videos, good work, keep it up pls

[silentdoctorable]

Just remember, what you see isn't the entire universe!

[juggaloryan3]

This is one of my favorite channels because not only are they informative and easy to understand, but Tony Darnell just seems like a genuinely nice guy! Thank you for all that you do. :)

[MrQuan2u]

awesome keep it comming!

[sushanalone]

Tx for covering this event for us , much appreciated,

[KILLUSALL92]

is't the black we see in space dark matter

[kurtilein3]

@KILLUSALL92

Nope. The black you see is just transparent vacuum that isnt illuminated by anything your eyes can see.

[KILLUSALL92]

@kurtilein3 oh ok thanks

[TheReasonWhyGuy]

Haha, I love that you still include the bloopers... it's a nice way to soften the mood :3

[TheReasonWhyGuy]

for those who still like to call "nuclear" things "new cue ler" things... try saying it like this "new clear"

it's easier, and sounds more like how it's spelled

[sbergman27]

@TheReasonWhyGuy It wasn't that long ago that we had a President of the United States who said 'nucular', and was also concerned about the performance of US high school students on standardized tests. Irony does not come in any purer form than that. Perhaps the problem is that we're just not 'teaching the controversy' enough...

[FordPrefect23]

@TheReasonWhyGuy You sound like Billy Connolly ranting about George Bush and his inability with English.

[Vilverin1]

@TheReasonWhyGuy new-clee-er

[TheReasonWhyGuy]

@Vilverin1 "new-clee-er"

That's exactly how I say it... I don't see the difference, unless you say the word "clear" in some retarded way ;P

[gcirc]

@tdarnell great video mate,keep up the good work.

[Rotorzilla]

thanks for the great videos!! Is there any way to access the Sloan data? looks like it would be fun to fly around those galaxies.

[NielsC68]

There has been many great news this week. The sad news in astrophysics this week must be the death of Steve Rawlings. :(

[Ksixstring]

thank u for a great week.

[antho862008]

thanks for your great posts

[vesji]

It's fun making them? It's astonishing watching them! Thank you so much for providing this kind of knowledge!! Now I can explain everything I couldn't to my wife! Oh happy day when my wife would understand space!

[Tethloach1]

these videos are great simply explained and fantastic images.

[bappo456]

Thank you for all the coverage and the easily understandable explanations, I appreciate these videos and always look forward to the next. Take care until next time.

[DarkMatter1958]

As usual:- A simple explanation, that my "Whole" family can understand.

Congratulations on getting to Fifty episodes and Look Forward to the next Fifty.

There will be PLENTY to talk about? ;)

[erdal0]

nustar? i can launch and make it for half the price.

[BinaryReader]

such a good guy, thank you for the videos. I really enjoy your enthusiasm for the topics and the way you present them. Awesome channel.

[Xiquid]

I love this channel! Keep it up!

[ZenSpider40]

ok, i think I need to roll a SAN check, I thought sound did not travel through a vacuum . I am obviously misunderstanding something here....uh, help?

[interfan63]

My head hurts

[vibol03]

define "downtown"?

[mio68df]

Your awesome! :D

[Hermoor]

What you don't realize is that the light from these galaxies are thousands of years old. Many of these galaxies could be or be weaker. All this is a waste of time...

[AtheistToothFairy]

@Hermoor:"What you don't realize is that the light from these galaxies are thousands of years old'

Thousands !?!?!?!?

[HaloZero147]

@Hermoor How, exactly? If only we had a time machine...

[MrGOTAMA420]

sooo.... there is a lot of dark energy downtown?

[MrGOTAMA420]

you rock T.

[Baronstone]

The big bang, a giant super massive blackhole that had become unstable and exploded

[TheBetterGame]

@Baronstone Could very well be. Could also be something like Cern. We honestly don't know. Wouldn't it suck if it was though?

[MrGOTAMA420]

@Baronstone is there any one workin back to this?

[wptte]

It's been an interesting week!

[TheEruditepolymath]

I thought sound waves or BAO did NOT propagate in space.

?

[smartzazi]

What if our whole observed universe is as big as a grain of sand at the very bottom of an Olympic sand castle?..

[Melee2Kil]

@smartzazi Thats probably right.

[BigMTBrain]

@smartzazi - Why do you think so small? Please watch this video: /watch?v=CEQouX5U0fc : SpaceRip: Cosmic Journeys: How Large is the Universe. An accepted estimate as to the minimum size of our universe is 10^23 times the size of the observable universe. That's FAR FAR FAR more dramatic than your analogy: The referenced video (at about 5:32) gives the size analogy of our observable universe to the unseen universe beyond our horizon as an atom to the size of our observable universe.

[MyFaceHole]

1:12 and there is suppose to be a god that ONLY created us, lol. There has to be other things out there. If you think there aren't you are ignorant.

[nmryda]

@MyFaceHole COSIGN my friend! Let 'em know!

[hla27b]

Baryonic acoustic oscillations??

You just made that up didn't you LOL

[tsjoencinema]

What do you think triggered the Big Bang, Tony Darnell?

[SomedaysDreamersBC]

50 episodes!!! lets party... I hope there will be cake...

[xXDEICIDE216Xx]

Also, who is the author to the book behind you entitled "Blackholes"?

[cjw1010]

@puff420x i love thinking about something like that it brings the grand scale of thing really amazing, maybe were an atom for a larger universe, which is an atom and so on. It's a lot of fun to stretch the imagination and think outside the box.

[xXDEICIDE216Xx]

Rated, Commented, and already subscribed. You rock Mr Darnell!

[ahg337]

Just like downtown

[SomedaysDreamersBC]

@ahg337 best line going on youtube.

[alienfast]

I, like the others, totally appreciate your videos! They are informative and fun and I'm constantly full of excitement awaiting your next video(s). Keep up the great work, and thanks a lot for doing this :)

[labobo]

Marked my calendar with the NuSTAR Launch date

This will be nice to looking at something new

[Kariakas]

Thanks for the videos this week Tony, very interesting stuff. I really enjoy your channel and appreciate your effort, I wish the media would report some of this stuff half as well as you do.

[RSKullcrusha]

Cheers!

[kevinmakus1]

Replacement for carl Sagan :)

[kevinmakus1]

Just thought I would leave a comment to show appreciation :) I absolutely love your videos Tony. Your a very intelligent man, and you've got a personality to you that comes off very humble. In all honesty, I think you make a perfect rep

[burtontoker]

the only one who knows is God

[Athiest2009]

Tony you are awesome. Loved the whole week of shows....

Just wanted to say thanks for all the work you put into informing us of what the professionals are discovering. And up is the only place to look!

[jazcamille]

One day I told my Mom I wanted to be an Astronaut and she said "you have to be smart for that". lol. Thanks Mom! :) At least I can feel like one when I watch your videos! :D

[billp1955]

Nuclear...nice jab! Thanks Tony

[Rfighter7]

AWESOME INFO!!!!

[Elis60660]

according to Homer Simpson it's "neucular.... NEUCULAR!" I mean, he works at a nuclear err... neucular powerplant, so he knows.

[ERBessette]

Here's to 50 more :)

[GoreTorn16]

Happy 50th SFN video Tony! :)

[Gibranmacias911]

How many telescopes and satellites does the US has and how many the rest of the world too

[dancethrushadow]

I <3 round #'s!

[adamjosiah123]

first haha