i still wonder if both time travel and travel to alternate earths are possible
The Nature of the Universe, Time Travel and More...
- Thread starter Will The Serious
- Start date
I'm travelling into the future at one second per second in my frame of reference. I can't remember travelling into the past as either my memory doesn't seem to work that way or my Feynman radio is on the blink.
If you travelled to an alternate Earth, how would you tell? Dolly from Moonraker no longer has metal braces on her teeth? The Monopoly Man no longer sports a monocle? The Fruit of the Loom logo no longer includes a cornucopia? Your garden gate is no longer squeaky?
If you travelled to an alternate Earth, how would you tell? Dolly from Moonraker no longer has metal braces on her teeth? The Monopoly Man no longer sports a monocle? The Fruit of the Loom logo no longer includes a cornucopia? Your garden gate is no longer squeaky?
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Yes!
LOL.
Relativity's space-time, likely means that you either can't travel into the past, or, if you do, you can't affect the future. This means, no buying the winning lottery ticket or Apple stock to improve your future fortune. It's all already written in stone, including your traveling back in time and what you did when you got there.
I think we already know how to tell if you travel to an alternate Earth, Spock has a goatee.
-Will
I think we already know how to tell if you travel to an alternate Earth, Spock has a goatee.
-Will
Indeed, the past, present and future are all fixed in Special Relativity - one of the reasons why it doesn't mesh with quantum mechanics. Superdeterminism is one solution to that issue; many worlds is another. Both might be correct or something else might be, such as Bohm's interpretation, which is fundamentally non-local. Unfortunately, falsifiability is tricky. Although there was a recent proposal for testing the many worlds interpretation, I think it might fall foul of unitarity and I don't think it would perhaps not disambiguate between alternative interpretations of many worlds. I have my own notions, but if they are untestable, they are metaphysics.Relativity's space-time, likely means that you either can't travel into the past, or, if you do, you can't affect the future. This means, no buying the winning lottery ticket or Apple stock to improve your future fortune. It's all already written in stone, including your traveling back in time and what you did when you got there.
I think we already know how to tell if you travel to an alternate Earth, Spock has a goatee.
-Will
i didn't want to start a new thread just for this one question, Sabine often points to this website: Brilliant dot org. Is it worth getting the premium? i have the free version and going through "scientific thinking". Solving daily puzzles is kinda fun but unsure if i should get the full experience.
If you have the disposable income, stamina and strength of will to do the exercises daily, it's worth it. Of course, Sabine is receiving income by advertising, but what she advertises is only occasionally frivolous.
thank you @Asbo Zaprudder 
I considered subscribing to Brilliant to brush up on all the stuff I learnt decades ago, but I decided my memory is no longer retentive enough and I just don't have the patience.thank you @Asbo Zaprudder
^ I am struggling with my memory too, it's not getting better with age=)
I mainly struggle with persistence. I wouldn't stick the course because I'd get bored or distracted by something else. There'd have to be a goal that I felt was worthy achieving. As I'm nearly 70, there's very little point in setting goals that no-one else cares about.
I'll be 60 next year. I'm thinking, it's always good to keep the brain working, being distracted by other things can be good as long as you do something or study something whatever it is..... the brain don't like to just sit there. You're closing in to 70?, that's cool
I actually look forward to be in my 60s =)
Yes, vegetating in from of the TV isn't my idea of fun. I'd rather experience things that are surprising and original. However, I'm also not prepared to do anything that feels like hard work. I'm too knackered for that.I'll be 60 next year. I'm thinking, it's always good to keep the brain working, being distracted by other things can be good as long as you do something or study something whatever it is..... the brain don't like to just sit there. You're closing in to 70?, that's cool
Well, I've been in my 60s for three years now. It isn't my mind I'm worried about. Knees, hips, back, wrist, shoulder, feet, neck, and my three stints are.
-Will
-Will
yeah the body is feeling the age for sure. I got the Polymyalgia rheumatica and couldn't raise my arms or walk very far. Every joint in my body was in pain. But when we found out what it was i started on cortisone, and it was so crazy, the next day, day and a half... i was completely fine!
Not cured of it, but taking cortisone pills every day let me live a very normal life =)
Not cured of it, but taking cortisone pills every day let me live a very normal life =)
all of this plus my fingers, i couldn't close my hand or grip something. Getting dressed in the morning was such a ordeal.... But i'm free of the pain now thanks to modern medicine =)=) 80 years ago i would have been an invalid.
I do have to say, that's the nature of the Universe we have to live in.
-Will
-Will
...and time travel
Just for context:
The energy released in a core-collapse supernova is typically 104 foe, consisting of 100 foe in neutrinos*, between 0.3 and 3 foe in the energy of the ejected mass and between 1 and 2 foe in EM radiation. The non-SI unit foe stands for ten to the power of fifty-one ergs, which is the same as ten to the power of forty-four (10^44) joules in SI units. The Sun will emit 1.2 foe of EM radiation and 0.028 foe of neutrinos in its ten billion year lifetime on the Main Sequence. The energy equivalence of its mass is 1787 foe and gravitational binding energy makes up circa 0.7% of this mass or about 12 foe or just over seven Jupiter masses. Stars that can explode as core-collapse supernovae typically have a mass between 8 and 45 times that of the Sun. Their percentage binding energy is lower than the Sun's, but most of it ends up being converted to neutrinos when the collapse happens.
One gram of firework powder releases 9.3 kilojoules or about ten thousand joules of energy. So a one-gram charge firework releases 10^4/10^44 or 10^-40 foe.
* The neutrinos result from electron capture by protons and thermal-pair annihilation. Approximately 10^58 neutrinos in the roughly 0.5 MeV (8x10^-14 joules) energy range are released, and these carry away 99% of the exploding star’s gravitational binding energy over a period of about 20 seconds.
For convenience, I'm using the term neutrinos to refer to both neutrinos and antineutrinos, whether of the electron, muon or tau varieties.
The energy released in a core-collapse supernova is typically 104 foe, consisting of 100 foe in neutrinos*, between 0.3 and 3 foe in the energy of the ejected mass and between 1 and 2 foe in EM radiation. The non-SI unit foe stands for ten to the power of fifty-one ergs, which is the same as ten to the power of forty-four (10^44) joules in SI units. The Sun will emit 1.2 foe of EM radiation and 0.028 foe of neutrinos in its ten billion year lifetime on the Main Sequence. The energy equivalence of its mass is 1787 foe and gravitational binding energy makes up circa 0.7% of this mass or about 12 foe or just over seven Jupiter masses. Stars that can explode as core-collapse supernovae typically have a mass between 8 and 45 times that of the Sun. Their percentage binding energy is lower than the Sun's, but most of it ends up being converted to neutrinos when the collapse happens.
One gram of firework powder releases 9.3 kilojoules or about ten thousand joules of energy. So a one-gram charge firework releases 10^4/10^44 or 10^-40 foe.
* The neutrinos result from electron capture by protons and thermal-pair annihilation. Approximately 10^58 neutrinos in the roughly 0.5 MeV (8x10^-14 joules) energy range are released, and these carry away 99% of the exploding star’s gravitational binding energy over a period of about 20 seconds.
For convenience, I'm using the term neutrinos to refer to both neutrinos and antineutrinos, whether of the electron, muon or tau varieties.
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