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re: Hubble telescope captures image of 2 galaxies colliding
Posted on 3/13/19 at 11:43 am to Kentucker
Posted on 3/13/19 at 11:43 am to Kentucker
quote:
Space continues to expand and this is causing the distance between galaxy clusters to increase. However, within clusters, gravity is still king. In our own Local Group, for example, the Milky Way, Andromeda, Triangulum and many small galaxies interact gravitationally.
My understanding is that we won’t be able to travel to another galaxy due to the rate of expansion. Or maybe I misread.
2
Posted on 3/13/19 at 11:47 am to Sneaky__Sally
quote:
I think the point is that there is so much "space" between stars / planets there are minimal actual "collisions" in such a scenario. For the large part they just kind of pass through one another and keep on trucking.
There may be few, if any, collisions between stars, but the gravitational effects will be potentially catastrophic for many solar systems. Planets may be pulled from the orbits of their parent stars. Even some entire solar systems will be hurled from both galaxies. It won't be an entirely peaceful merger of the two galaxies into the new Milkomeda.
Posted on 3/13/19 at 11:58 am to Walking the Earth
quote:Or an Asian.
woman must have been driving one of the galaxies.
Posted on 3/13/19 at 12:01 pm to weagle99
quote:
Let this sink in: We are seeing something that happened 230 million years ago in the image.
Posted on 3/13/19 at 12:03 pm to weagle99
quote:
My understanding is that we won’t be able to travel to another galaxy due to the rate of expansion. Or maybe I misread.
We certainly won't be able to travel to other galaxies but, even more stark, we won't even be able to see in the future some of the galaxies that are currently within sight of our telescopes.
The expansion of space is exponential. The further from us a galaxy is, the faster is the distance between us increasing, and it continues to speed up. At the cosmological horizon, or light horizon, the rate of increase exceeds the speed of light. This means that when a distant galaxy crosses that boundary, we will no longer be able to detect it.
Under current theory, as time goes by everything will be subject to this expansion. Not just galaxies will be affected. Eventually, molecules and even atoms will be forced to break apart. This will mark the end of our Universe.
Posted on 3/13/19 at 12:16 pm to weagle99
I fricking love the Hubble telescope
Posted on 3/13/19 at 12:22 pm to Kentucker
quote:
We certainly won't be able to travel to other galaxies but, even more stark, we won't even be able to see in the future some of the galaxies that are currently within sight of our telescopes.
The expansion of space is exponential. The further from us a galaxy is, the faster is the distance between us increasing, and it continues to speed up. At the cosmological horizon, or light horizon, the rate of increase exceeds the speed of light. This means that when a distant galaxy crosses that boundary, we will no longer be able to detect it.
Under current theory, as time goes by everything will be subject to this expansion. Not just galaxies will be affected. Eventually, molecules and even atoms will be forced to break apart. This will mark the end of our Universe.
I didn't think it was possible for anything to move faster than the speed of light. Are you saying that things are moving apart in opposite directions and both going the speed of light?
Do you think there will be a big collapse once the big bang loses its momentum and gravity pulls it all back together?
Posted on 3/13/19 at 12:23 pm to weagle99
quote:
My understanding is that we won’t be able to travel to another galaxy due to the rate of expansion.
In this dimension.
Posted on 3/13/19 at 1:02 pm to RedHawk
quote:
I didn't think it was possible for anything to move faster than the speed of light.
Nothing can travel faster than the speed of light in space. However, it is space itself that is expanding.
quote:
Do you think there will be a big collapse once the big bang loses its momentum and gravity pulls it all back together?
The rate of expansion appears to be increasing, not decreasing.
This post was edited on 3/13/19 at 1:11 pm
Posted on 3/13/19 at 1:15 pm to weagle99
I wonder what it actually looks like now. As opposed to the 230 million light year old picture they have now.
Posted on 3/13/19 at 1:47 pm to Bustedsack
quote:
Looks like 1 big galaxy.
That was 230 million years ago. It is one big galaxy now.
Posted on 3/13/19 at 1:49 pm to MountainTiger
quote:
The rate of expansion appears to be increasing, not decreasing.
I believe it will eventually stop expanding and then have the big crunch/collapse and then another big bang. Makes me wonder if this has all happened millions of times already.
Posted on 3/13/19 at 1:59 pm to Kentucker
Its not a new milkomeda though - i mean in some cases it might be depending on their prior trajectories. But with time, they will once again be separate galaxies going their own ways.
From what i've read on it, the number of stars / solar systems which would see "catastrophic" effects would be statistically insignificant according to people who study such things.
ETA: that kind of depends on speeds, trajectories, etc. I guess. So I guess milkomeda could be the anticipated final result depending on those factors.
From what i've read on it, the number of stars / solar systems which would see "catastrophic" effects would be statistically insignificant according to people who study such things.
ETA: that kind of depends on speeds, trajectories, etc. I guess. So I guess milkomeda could be the anticipated final result depending on those factors.
This post was edited on 3/13/19 at 2:03 pm
Posted on 3/13/19 at 2:09 pm to RedHawk
I am almost certain that is no longer the mainstream theory. It was in the early 20th century tho.
Posted on 3/13/19 at 2:12 pm to RedHawk
quote:
I believe it will eventually stop expanding and then have the big crunch/collapse and then another big bang. Makes me wonder if this has all happened millions of times already.
That theory has a nice symmetry to it but unfortunately there's no evidence for it. In fact the accelerating expansion is evidence against it.
This post was edited on 3/13/19 at 2:17 pm
Posted on 3/13/19 at 2:14 pm to RedHawk
quote:
I didn't think it was possible for anything to move faster than the speed of light. Are you saying that things are moving apart in opposite directions and both going the speed of light?
The speed limit of light applies to matter, not to space. The expansion of space has no known speed limit. Matter is being propelled into space at an increasing rate by Dark Energy.
quote:
Do you think there will be a big collapse once the big bang loses its momentum and gravity pulls it all back together?
Current theory says no. About 6 billion years ago, Dark Energy’s repulsive force overcame the attractive force of gravity. This seemingly doom s our Universe to a fate of dispersion down to the quantum level.
Posted on 3/13/19 at 2:18 pm to LSU Patrick
quote:
That was 230 million years ago. It is one big galaxy now.
Probably not too different from 230 million years ago. It takes billions of years for the gravitational effects to settle down after galaxies collide. It’ll settle into a spheroidal eliptical galaxy.
Posted on 3/13/19 at 2:27 pm to Sneaky__Sally
quote:
ETA: that kind of depends on speeds, trajectories, etc. I guess. So I guess milkomeda could be the anticipated final result depending on those factors.
Right. Based upon the anticipated angle of collision, Andromeda and the Milky Way will become one eliptical galaxy. Andromeda is a spiral galaxy containing 1 trillion stars and the Milky Way is a barred spiral galaxy with approximately 400 billion stars.
While Andromeda is much bigger in size than the Milky Way, the latter is much more massive than the former. Our galaxy’s gravity is much stronger than Andromeda’s because of the amount of Dark Matter surrounding us. It’s us pulling them towards a collision, oddly enough.
Posted on 3/13/19 at 2:39 pm to Kentucker
quote:
Current theory says no. About 6 billion years ago, Dark Energy’s repulsive force overcame the attractive force of gravity. This seemingly doom s our Universe to a fate of dispersion down to the quantum level.
There are a couple different interpretations, the "Big Split" where dispersion as such small scales eventually rips apart the fabric of space-time and "the Big Freeze" where shite gets spread apart and becomes a cold dead universe.
These theories are pretty spotty even in comparison to other theories in physics / astronomy. People just don't have much of a clue about what is going on with Dark Energy / Dark Matter so its hard to trust that kind of extrapolation at this point IMO.
Posted on 3/13/19 at 3:17 pm to nuwaydawg
quote:
nuwaydawg
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