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Patricia Burchat: The search for dark energy and dark matter

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http://www.ted.com Physicist Patricia Burchat sheds light on two basic ingredients of our universe: dark matter and dark energy. Comprising 96% of the universe between them, they can't be directly measured, but their influence is immense.

Tags for this video: Astronomy BaBar bang Big Burchat Collaboration Education Energy Patricia Physics Science Stanford talks TED TEDtalks

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Geeezz... you don't ... ( 3 months ago by Z06Lingenfelter)

Geeezz... you don't need scientist to figure all this out. Obviously it was inside job.
A lot of ppl know why we will never find out the truth.
...i find amazing that u didn't get that.
Anyway... very cool video , I luv u Patricia :)))

can anyone tell me ... ( 3 months ago by leonmcveigh)

can anyone tell me a answer please.
if you observe the universe from a fixed posiston do all galaxies spin the same direction and what and if yes or no, why?

No, because ... ( 3 months ago by blackmanfu)

No, because galaxies are in a very different position and orientation, depending on where you are observing them.
Imagine you are sitting in the middle of a glass automobile, moving forward. You look at the left wheels and notice they appear to be moving clockwise. You look to the right, and those wheels appear to be moving counter-clockwise.
so from a fixed position, the rotating galaxies won't be moving in the same direction, precisely from this principle: we're surrounded by them.

she did a very good ... ( 3 months ago by blackmanfu)

she did a very good job at explaining gravitational lensing in layman's terms

What bothers me is ... ( 3 months ago by Digeridude)

What bothers me is that physics is such a popularity contest. Dark matter theory could be correct, but the inexplicable mass of the universe could also suggest that the equations believed to govern matter could simply be wrong.
I know it's painful to go back to the drawing board, but it's far better than compounding theory upon theory until we're mired in popular opinions and all struggling to agree with one another.
Yeah, the current ideas WORK, but they're hardly elegant.

thank you ,that ... ( 3 months ago by leonmcveigh)

thank you ,that makes sense. do you know what determins which way they travel is it just to do with how much mass is near to the paticular galaxy. and if you were veiwing the cosmos from the edge of the universe would they be spinning in random directions.
thanks for the time.

Popularity contest? ... ( 3 months ago by atleastitsnotcrack)

Popularity contest? Sounds like the behavour of religions! Sad thing is your right. It all really is a work in progress the more we see the more we can make sense of. The science forum is ment to be an open one which is better then just believing what we are told from those before us. I too wonder what if all this is wrong?

as to which way ... ( 3 months ago by blackmanfu)

as to which way they travel, I'm sure a lot of factors depend on that. For example, the milky way and andromeda galaxies' spins were the result of a collision between the two galaxies billions of years ago. That collision resulted in the spin that we see today (apparently they both used to be elliptical galaxies). I'm not sure how much mass near a particular galaxy would affect its spin, but it could very well do so.
As for the edge of the universe, good question, I have no clue :P

There's always talk ... ( 3 months ago by EngleburtHumperdink1)

There's always talk that space is expanding. I can picture that but never what is it expanding on? or through? non space? What's on the other side of space? before space expands onto/over/through it?

That's what peer ... ( 3 months ago by WhatisaJugallo)

That's what peer review is for. Anyone who says "this is all well and good but what if all the axioms and assumptions it's built upon are wrong?" doesn't understand how the science community works. Whenever a new theory/idea comes forward it's not a matter of "sweet, what else can we build on this?" It's immediately target of scrutiny, there is more 'glory' to be had in disproving the status quo than coming up with more to add to it. (cont.)

We know that what ... ( 3 months ago by WhatisaJugallo)

We know that what we know about 'normal' matter now is good because scientists have been trying to disprove it for dozens of years and found nothing but more verification. If someone puts forward a new theory of Newtonian/quantum physics that redefines how we look at matter that theory will be subject to the same rigorous attempts to disprove it and if it survives that then whoever came up with it would be heralded as one of the smartest scientists in history.

i wonder whats ... ( 3 months ago by Viodin0)

i wonder whats happens when you get to the end...because if its expanding, its expanding from its outer limits outwards right?....i wish we could go fast enough to reach the end just to see the result...

No. The universe is ... ( 3 months ago by kubush)

No. The universe is infinite in size. There is no end.
watch?v=K6VkKk9iVQk

Woderful exposition ... ( 2 months ago by eddylevin)

Woderful exposition of a new vista, but what is the difference /similarity between black holes at the centre of the Galaxy and the black space and black energy throughout the cosmos. Are they the same thing as the black holes?

That was awesome. ... ( 2 months ago by halcyonyear)

That was awesome. The mystery in physics has been restored.

Array ( 1 month ago by jetmanisme)

Hi eddylevin,
Dark Matter and Dark Energy are vastly different from black holes. Dark Matter is just a fancy name for "we don't know what it is." We can't see it directly or know what it is, but we know it's there because of its gravitational effects. Dark Energy is also something that we don't know what it is, but know it's there because space is expanding while it shouldn't be given the amount of matter in the universe. Therefore, there must be some energy making the universe expand.

Black holes on the ... ( 1 month ago by jetmanisme)

Black holes on the other hand defined as an object from which no light can escape within a certain distance. Basically they're created when enough matter/energy gets scrunched into a short enough distance such as when a large star runs out of fuel and collapses in on itself via gravity. Think of it as a cosmic drain; it's not dangerous unless you get within a certain distance and then you'll be pulled into what can be considered to be the ultimate trash compactor. Hope this helps.

physics is badass ( 1 month ago by robotaholic)

physics is badass

I know what you're ... ( 1 month ago by ihateuutube)

I know what you're thinking. Dark matter is meant to account for the increased speed of stars on the farther edges of galaxies. Supermassive black holes are thought to exist at the centers of all galaxies. Why couldn't a black hole be causing this increase in speed? The reason is that a black hole would still accelerate the central stars more than the outer ones. You would still see a decrease in speed as you moved outward.

ok, nvm maybe you ... ( 1 month ago by ihateuutube)

ok, nvm maybe you weren't thinking that.

Array ( 1 month ago by qwertybaa)

Dear Mrs. Chown,
Ignore your son's attemps to explain You phisics. Phisics isn't the most important thing. Love is.
Best Wishes
Richard Feynman

she..was.. ... ( 2 weeks ago by 144md)

she..was..absolutely..amazing.
She cleared up a lot of my confusion. So wonderful ^_^ amazing!

Array ( 1 week ago by forgotmypassword3)

I bet they are.
Study volcanoes.

why would they ... ( 3 days ago by jeffbrown8)

why would they create a detector deep within a mine , for dark matter? i'm just curious why they have to go deep in the earth to find it.. if dark matter is everywhere (i know not detectable yet) but everywhere?