NOVA: The Dark Matter Mystery

[thetruthis9]

they uploaded this video twice...

[tonypata]

So, Nova has basicaly become a children's show. Remember Zoom and The Electric Company.

[eziekiel9989]

the gravity is drawn to the galaxies because of the black whole in the center of all galaxies...

'3: 45 there is clearly some stuff there that is not normal matter and is making alot of gravity'

black wholes: points of infinity

dark matter is the singularity at the center of being

[StudioSCAPE]

Its LHC (Large Hadron Collider.)

[GetMeThere1]

I don't know....sounds racist to me ;)

[Utka9]

Interesting...what about the LCH?

[starlette92]

(Part 5)

I hope what i've written here helps somewhat in understanding the study of dark matter, or at the very least, why dark matter isn't "just" a theory

[starlette92]

(Part 4)

the studies show the dark matter is likely distributed in some sort of halo, dispersed all around the galaxy, but especially "dense" in the outer regions of the galaxy.

dark matter isn't a miscalculation at all. there is a lot of evidence supporting it, and theoretical models which use dark matter in that halo configuration mentioned above, are MUCH better at replicating real galaxy behaviour than models without.

for further information, check out undergraduate astronomy texts.

[starlette92]

(Part 3)

possible candidates are lone black holes (not accreting matter or in a binary system, where it could easily be detected), neutrinos, lone brown dwarfs (no-fusing, Jupiter-type bodies), among other things.

you may also think that matter that gets swallowed in a black hole might be a candidate, but the black hole grows in size after swallowing the matter, so its mass isn't "lost"

also, studies of the motion in galaxies tells us that the dark matter isn't clumped at the center

[starlette92]

(Part 2)

i.e., stars + gas + dust + black hole(s) + planets + etc... is much less than what is responsible for the motions. it is not implausible that there is some form of matter which does not radiate in observable bands and which is not near other visible bodies such that we could measure its gravitational influence over those bodies. in essence, dark matter is dark since we can't "see" it in any (current) way other than its inferred gravitational influence.

[starlette92]

(Part 1) dark matter beyond the edge of the observable universe is not a possibility. since it is past the "edge", there's no way it could influence events "here", where we're studying.

the mass of known black holes in galaxies is already taken into account in these calculations of the missing mass.

there are equations which describe the motion within galaxies, and some of these, in order to account for the motion we observe, requires there to be much more mass in that galaxy than is there

[dreamrelics]

YA!. Love the show.

Billions and Billions.

What I have not heard explained about dark matter is this. What about the black holes at the center of galaxies? Those have tremendous amounts of gravity, don't they?

and... the missing matter, What about the matter, what about the matter beyond the observable edge of the universe?

Is the dark matter only out there? Is there some right here on earth?

I have the feeling that its existence is a miscalculation of some sort.

More physics please.

thnx

[astrofyre]

PBS Rocks! I have grown up because of PBS and grown more informed because of the many great programs. Thank you Mister Rogers for making PBS possible.