What Galaxy Clusters Teach Us About Dark Matter - Ask a Spaceman!

What are galaxy clusters made of, besides galaxies? How can we use them to understand dark matter? And how can we make pretend ones on a computer?

Keep those questions about space, science, astronomy, astrophysics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE! Music by Jason Grady and Nick Bain.

[ChrisBrengel]

1:01 "...plus or minus a couple of hundred galaxies, who cares..." LOL!

[CarinaPrimaBallerina]

Great video, and I love your way of pronouncing Dunkle Materie :-D

[antoniomaraziti]

Great video, great communication skills as usual, thanks.

[marinangelov]

Shouldn’t it be called transparent matter rather than dark matter?

[infinitemonkey]

Shouldn't individual galaxies like the Milky Way also come apart if only accounting for visible matter ?

[NonEventHorizon]

Do the voids exert some kind of pressure against bubbles of space-time?

[russellneitzke]

Perhaps dark matter is a galactic interaction that results in space folding more the closer massive structures get together.

[hotrodandrube]

Or maybe black holes have more mass than we have measured on the other side of the event horizon.

[michael]

Your video started out wonderfully, but, I felt, ended too quickly.

Maybe you can a brief comment on hypotheses of what dark matter is?

Thanks for posting this. I will be looking at some of your other videos.

[angusmacleod]

Hey I love your videos was wondering if you could put an ask a spaceman playlist in chronological order makes a great listen that way

[phoule]

Paul, do you have any hunches about dark matter? do you think the answer to gravity (whether a particle, a field, effects from another dimension felt in ours...) is also the answer to dark matter?

[vfvico]

yet another case where Fritz Zwicky was on it. too bad there isn't a decent documentary film about him. there should be. not just a genius who made big contributions to modern astronomy, but a cranky, difficult, interesting character.

[Saitama]

Maybe we could call it "virtual matter"?

[thekingofmojacar]

Hi Paul, thanks for your nice recitation.... we humans have a small problem, we don´t really accept things we don´t see and this is the main reason we still (or may be never) don´t understand the deeper sense of black holes, dark matter and dark flow.... what the farmer doesn´t see, he won´t believe, the same story happen with astronomer and astrophysics.... and there are many things we don´t see or understand because we are just not "prepared or destinated" for! Our dimension, the "material human earth dimension" or said with other words "the human short time life adventure at earth" is limited by the enourmes distances in space and time, as well we don´t understand the spiritual influences from "the other side", this completly spiritual world, we are calling in filosophy our "super-ego").
Of course, dark matter is just not an empty space, but its a perfect place to hide the (for us) secret laws of evolution, transformation and destiny of the whole universe (only this one, because there are paralel universes with different physic laws and functioning).
We humans still have a problem to understand the really big things (multiverse) and really small things (quantum mecanics), I think we are on the right way, but we are limited and just not important or powerfull enough to take part of the "higher dimensions".... I think the best way to come closer to this higher realities would be an intensive studying from quantum mecanics, advanced astrophysics, Buddhism and deep philosophy, so we would come (a little bit) closer to the realties behind the organic material reality, so we could even understand better the genesis or real existence of spirituality, soul-travelling, reading thoughts and emotions, mental transport to other galaxies - just one word: complete consciousness and 100% capacity and use of our brains! Nice regards, I wish luck and satisfaction for everybody!

[mikecavedon]

Dark matter is a supersolid that fills 'empty' space, strongly interacts with ordinary matter and is displaced by ordinary matter. What is referred to geometrically as curved spacetime physically exists in nature as the state of displacement of the supersolid dark matter. The state of displacement of the supersolid dark matter is gravity.

The supersolid dark matter displaced by a galaxy pushes back, causing the stars in the outer arms of the galaxy to orbit the galactic center at the rate in which they do.

Displaced supersolid dark matter is curved spacetime.

In the Bullet Cluster collision the dark matter has not separated from the ordinary matter. The collision is analogous to two boats that collide, the boats slow down and their bow waves continue to propagate. The water has not separated from the boats, the bow waves have. In the Bullet Cluster collision the galaxy's associated dark matter displacement waves have separated from the colliding galaxies, causing the light to lense as it passes through the waves.

[pyne]

You need a background image instead of your head. Also maybe just the science.... your not the best storyteller. Think John Michael Godier.