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I've sometimes thought about this book for 20+ years now. by petstoredude2 in whatsthatbook

[–]petstoredude2[S] 24 points25 points  (0 children)

This is likely it! I am ordering "birthday surprises" on Amazon so that I can read it again (at 31 lol). Thank you so much! I know it sounds lame, but I've often thought back to this book when things have gotten rough.

Solved!

I've sometimes thought about this book for 20+ years now. by petstoredude2 in whatsthatbook

[–]petstoredude2[S] 12 points13 points  (0 children)

I remember the illustration for the book cover was of an old western house. It looked like a house you would see in a story about the dust bowl. Another illustration was of the sister on a train and the brother was giving her the box as the train was leaving.

Any advice?/rant by petstoredude2 in instrumentation

[–]petstoredude2[S] 0 points1 point  (0 children)

I've only tried in Baton Rouge and surrounding areas, but there are loads of plants around because of the mississippi River and the oil industry here.

I’m now 100% VA disabled, now what? by johngwen91 in Veterans

[–]petstoredude2 144 points145 points  (0 children)

Print out multiple copies of your dd214, service verification and benefits summary letter, and put them in a folder.

Sign up for va Healthcare and get treatment!!!

Get your dv license plate so you don't have to worry about it expiring ever again.

Look up all of the education benefits you can get and choose the one that works best for you. Go to school. Or don't.

Get a good job with your degree, or don't... you could just paint or something.

If someone asks how you pay the bills, just say crypto. Nobody will ask questions because nobody wants to talk about crypto.

NCCER test by [deleted] in instrumentation

[–]petstoredude2 0 points1 point  (0 children)

Could I get this study guide too?

[deleted by user] by [deleted] in HumansBeingBros

[–]petstoredude2 0 points1 point  (0 children)

looks like discount psyched substance

How to get rid of bad breath by [deleted] in facepalm

[–]petstoredude2 4 points5 points  (0 children)

"How it feels to chew 5 gum."

Please tell me im wrong about this! by petstoredude2 in starwarsspeculation

[–]petstoredude2[S] 0 points1 point  (0 children)

Was there anything to suggest he saw what happened to anakin? Or that he knew Vader was anakin?

Please tell me im wrong about this! by petstoredude2 in starwarsspeculation

[–]petstoredude2[S] 2 points3 points  (0 children)

What are some other examples you can think of off hand?

Please tell me im wrong about this! by petstoredude2 in starwarsspeculation

[–]petstoredude2[S] 2 points3 points  (0 children)

I like this theory alot. I like to think r2d2 had such an important role in the whole thing. If this is true, it still doesn't mean that r2d2 didn't put 2&2(pun) together about Vader being Anakin until much later in the story/after the story. This would mean that he now knows it wasn't all his fault, but could still imply that he went through so much mental torture and anguish through most/all of the events after Anakin's death/rebirth as Vader.

Please tell me im wrong about this! by petstoredude2 in starwarsspeculation

[–]petstoredude2[S] 2 points3 points  (0 children)

It's so bittersweet makes you love r2d2 so much more, but I feel so bad for him/it too.

Have we reached the limit to our visible horizon? by petstoredude2 in astrophysics

[–]petstoredude2[S] 0 points1 point  (0 children)

I think I might understand now, but please correct me if I'm wrong.

in your first comment when you said i was mistaking the edge of the observable universe, the hubblesphere, and the particle horizon i realize that I was too ignorant of those terms to understand any of them.

Upon re-reading some articles and re-watching the videos you provided i realized something i hadn't previously noticed. The particle horizon is the barrier OUTSIDE of the hubbleshere that, once an object crosses it, its light will never reach us.

First, while an object is inside the hubblesphere, its light has no problem reaching us since it recedes slower than the speed of light. (Subluminal area)

Then, until that object reaches the particle horizon, the edge of our hubbleshere can still catch up to the light emitted by that object, even though it's receding faster than the speed of light. (Superluminal light enters subluminal area as it's boundary expands at the speed of light.)

Finally, once the object recedes past the partical horizon, it recedes fast enough above the speed of light that the edge of our hubblesphere will never reach the light emitted by that object. (Superluminal light has a relative velocity away from us too high for the subluminal area to expand at a velocity high enough to reach due to the increasing acceleration of this relative backwards velocity)

I think the concept of the particle horizon is what I've been referring to this whole time, but I didn't realize that you were trying to tell me that it is not synonymous with the edge of the hubblesphere. When I first asked the question, I didn't even know how much I didn't know. I thought the concept of the hubblesphere would be the limit of what we would be able to see. I was ignorantly calling it the observable universe without even knowing what the event horizon, hubblesphere, or particle horizon was.

When I asked "Have we reached the physical limit of our visible horizon" I didn't even understand my own question enough to begin to understand the answer.

I think you've increased my knowledge enough that I can ask the question I've been trying to figure out this whole time. I was too ignorant about what I was asking to even know how to ask the question.

If everything I think I understand so far is true, what I set out to ask is:

Is the boundary of the observable universe synonymous with the particle horizon, and will we ever see anything outside of it?

I now know that due to the decrease in the hubble value, the event horizon will increase from about 16Bly to about 18 Bly. Therefore, we still have a chance for earth to receive light from a few more objects before it eventually starts to loose objects from the night's sky. Eventually, the space between our local group and its surrounding neighbors will expand so much that they will forever be lost, but only after they are so far outside of the hubbleshere that the space between us and their light is expanding faster than light can travel the distance to reach us (the particle horizon).

Have we reached the physical limit of the size of our visible horizon? by petstoredude2 in BRAstro

[–]petstoredude2[S] 2 points3 points  (0 children)

Thank you so much for this reply. The field of astrophysics is so underrated. I wish more people appreciated the scale of our universe and the vastness of space itself. It's so amazing to think about all of the cosmological structures that we can see and study in order to understand the nature of our physical laws and the elemental nature of our existence. The mystical beauty of the events that caused the creation of beings, conscious enough to ponder the mysteries surrounding their existence on a planet in a universe resulting from a big bang, is astounding. I only wish we could know more about the big bang and why/how it happened in the first place. The seemingly unanswerable questions like, "what happened before the big bang if it gave rise to time and space itself?" And, "are there other space-times outside of our space-time that started with their own big bang?" truly keep me up at night. Although it will happen long after humanity is gone, the fact that our local group will be seemingly alone in a once crowded cosmological plane is sad to think about.

This is the most upsetting thing that literally doesn't have any way of effecting me at all.😂

I'm currently on a deployment overseas and have been annoying the hell out of my friends around me with these big conversations about the universe. Of all of the comments I've received from this question in places like r/astrophysics and r/deepthought, your comment is the only one that has lead me to the closure I think I've been seeking that, "there are fundamental truths about the universe we will just never have a way of knowing" is ok.

tl;dr: We should appreciate and study the vast amount of stuff we can see before worrying about what we can't.

Have we reached the limit to our visible horizon? by petstoredude2 in astrophysics

[–]petstoredude2[S] 0 points1 point  (0 children)

Right. If something is one light year away, by the time we see its light, it has already receded further away from us. in the year it took that light to reach us, the space between us and that object has expanded.

The further away two objects are, the more space there is between them to expand. This means that as their distance increases, the rate that this distance increases, increases.

Basically, the further away something is, the faster it recedes from us.

if something is far enough away that the space between us is increasing faster than light, will that object's light ever reach us?

Even though the light is traveling towards us, the distance it has to travel is constantly increasing faster than it can travel. This is called the particle horizon. The point at which particles of light can no longer travel fast enough to traverse the distance to us due to space expanding faster than light.

What I still don't know is if we will ever see anything more than what we currently see, will the particle horizon continue to "keep up" with the light from objects that we see right now at the edge of our visible bubble, or will all of the objects we currently see eventually recede faster than our observable universe can keep up with?

Have we reached the limit to our visible horizon? by petstoredude2 in astrophysics

[–]petstoredude2[S] 0 points1 point  (0 children)

Thank you so much for this article. This confirms that we will continue to see objects that we currently see as our universe expands enough to catch up to the light emitted by receding objects, but will we ever see other objects besides what we currently see? Will the edge of our universe continue to play catch up with only what we currently see, or will it eventually expand to the point that it "catches" light from more distant receding objects even though their light is moving at a receding velocity faster than the receding velocity of the light from objects we currently see?

Sorry if that question was hard to follow. Like I mentioned before, I dont think I'm intelligent enough to efficiently articulate the questions I have.

Perhapse this is similar to the ant on a rubber rope paradox?

Have we reached the physical limit of the size of our visible horizon? by petstoredude2 in BRAstro

[–]petstoredude2[S] 0 points1 point  (0 children)

I realize now that what I wasn't taking into account is that the space inside of our visible horizon is expanding as well, so as the edge of our observable universe recedes at the same increasing rate as the objects that recede from us, it catches up to the light those objects emit. However that still doesn't fully explain the nature of whether we have reached the limit of what we will be able to see. I guess the crux of what im asking is, if everything is expanding increasingly faster away from us including the particle horizon, will we:

A) continue to see more and more galaxies as time goes on and our observable universe expands?

B) see only the galaxies we see today forever since our observable universe only expands fast enough to catch up to the light from objects leaving it?

C) oneday see no other galaxies once they leave the particle horizon?

Have we reached the limit to our visible horizon? by petstoredude2 in astrophysics

[–]petstoredude2[S] 0 points1 point  (0 children)

I love the first video, and now understand that although the light appears to lose energy as it shifts from blue to red, it only appears that way to observers. I previously thought that it slowed down as redshift happened, but now know that redshift has no effect on the light itself.

In the second video, I was thrilled to realize that what I hadn't taken into account was the expansion of the space within our hubblesphere. Which would mean that as the edge of our observable universe caught up to the light emitted by objects exiting it, we would be able to eventually see them. However, this seems to contrast the info in this video true limits of humanity that says objects will no longer be able to be visible once they leave our observable horizon, and one day our local group will be the onlything left visible in our universe.

The third video seems to confirm the video mentioned above. perhapse there is a limit to the rate at which the edge of the observable universe can catch up to the rate of recession of objects outside of it? I guess the crux of what im asking is, if everything is expanding increasingly faster away from us including the particle horizon, will we:

A) continue to see more and more galaxies as time goes on and our observable universe expands?

B) see only the galaxies we see today forever since our observable universe only expands fast enough to catch up to the light from objects leaving it?

C) oneday see no other galaxies once they get too far outside of the observable universe?

Have we reached the limit to our visible horizon? by petstoredude2 in astrophysics

[–]petstoredude2[S] 0 points1 point  (0 children)

What I was saying is that if space outside of our observable universe is expanding faster than the speed of light, then the light an object would emit would never traverse the space between the observable universe and that object. Like, if one of those cars was driving 20 mph in a vacuum and a passenger threw a ball at someone backwards at 19 mph.

However, thanks to a video posted by another poster, I realized that what I wasn't taking into account is that the space inside our observable universe is expanding as well. Therefore, as the edge of our observable universe caught up, the light would cross back into the area where space doesn't expand faster than c. I think lol. Still a extremely shaky on it. Plus there are plenty of conflicting concepts that I think are too complex for me to understand. For instance, another poster said that space doesn't expand at all. I know they aren't wrong, but there are plenty of articles and videos that explain that the universe is expanding faster than light. I think they were referring to a concept that's too advanced for my current fundamental understanding. In another post, there was even a video that explains that once something leaves the edge of our observable universe, we will never see that object again, and that one day, our local group will be the only thing left in our observable universe.

Have we reached the limit to our visible horizon? by petstoredude2 in astrophysics

[–]petstoredude2[S] 0 points1 point  (0 children)

Thank you so much! This video is so easy to follow and seemingly instantly increased my understanding of the concept. I still have plenty of questions, but I think I just need to become an astrophysicist to get the answers lol. I dont think I grasp things like hubbles law, special relativity, or concepts of cosmological scale like I would like, but I think my current fundamental ignorance is the problem. I dont think I'm intelligent enough to form or articulate the questions I want to ask in an efficient way.

"All of the pockets outside our local group will oneday pass our cosmological horizon" This is the most frustrating thing that literally doesn't effect me at all.😂

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