The entropy of systems

The article says that the merger will be complete in another few million years, and it happened something like 300 million years ago...
I've read that the speed of some other cluster collisions are about 650- 800 km/s range.
It is relatively slow in terms of galactic scale. Still I'd want to be out of the way from something coming in our direction at that speed!

It is still mayhem to me.

So you are saying the amount of matter vs energy remains the same after such collisions?

Stoat:

If you don't mind, let's take some time off for a few weeks. Have some great time with family and friends during the holidays.

Okay, have a good one GD[]

As I say, I have problems with the speed this thing whacks into the bigger cluster. Note that the article goes on about dark matter and dark energy, so the problem has been noticed. It needs to be very fast to show the "balistic" effects but then it shoul punch its way through.

So thinking about my bubbles again. Two bunches of them. Let's say that the bubbles are sticky because of Casimer forces (these are massive plates coming together). These hold the galaxies in place and give it a low inertial mass but don't effect its mass. Now, a bigger bubble can consume a smaller one. With lower inertial mass this consumed galaxy cluster can stop very quickly. It can also transport the shock waves very quickly.

Talking about those swarms of bees. The surface of our galaxy bubble bullet, should look like dimpled honeycomb at its boundaries. When it hits I would expect a ring but also a pattern of points of differing energy density, associatied with the boundary nodes of both clusters. Mother Nature doing metric engineering perhaps.

Last night I actually went to bed worrying about the poor tea drinkers of these clusters. What horrible sin did they do to deserve that? I consoled myself with the idea that it all happened a long time ago and some of them could have moved house. [] I suppose we'll know soon enough, we will crash into the Virgo cluster some time.

"Remember, a galaxy is forever, and not just for Christmas [][][8D]"

Hello Stoat,

It's been one year already! How time flies! Actually we've covered quite a distance in our galaxy. I read the solar system moves at approx. 220 km/s (note: I think this speed will vary with time)around the galactic center. Ever wondered where our solar system is leading us?
Time, distance, acceleration, mass, energy, force....

What causes a mass (planets, galaxies, clusters, you -towards the ground)to accelerate in space?

So what is this force in the universe which moves planets and galaxy clusters?
Newton, in the late 1600's, called it Gravity.

How would Stoat describe this force?

...By the way, I hope you had a good year!

Hi GD [] Where ya been?

Family... work... it seems we are always running after time...
I think time is the only intangible factor in this world.

I found something interesting which brought me back to this forum: the comparison between electrostatics and gravity (see the link below)

en.wikipedia.org/wiki/Electric_field#Par...ostatics_and_gravity

F=mg or F=ma was Newton's legacy, but the other equation relating force and energy came much later.
If Newton would have known Charles Coulomb...

In this comparison there is a list of similarities and differences between energy fields* and gravity.
*(I suspect: varying energy fields with time or distance)

I would like to test these four differences (If there are no differences....)

no.4: "electric charges in an energy field are invariant."
If you click on "invariant" this brings you to another link: "charge invariance" In the second paragraph it mentions the speculative nature of charge invariance!!
I think gravitational charges (relativistic mass)is not well understood. What happens to a particle when it is accelerated to the speed of light? Does it keep its coherence? I think the only thing that moves at the speed of light in the universe... is light!!
Help me out Stoat... Can we cancel out no.4...