Skip to content
 
If you can read this, either the style sheet didn't load or you have an older browser that doesn't support style sheets. Try clearing your browser cache and refreshing the page.

(Jalopnik)   Speed of light is as fast as anything can go, but it's really, really slow   (jalopnik.com) divider line
    More: Interesting, Universe, NASA, Physical constant, Solar System, General relativity, Light, Vacuum, Spacetime  
•       •       •

2898 clicks; posted to Fandom » on 14 Jun 2020 at 1:20 AM (18 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



74 Comments     (+0 »)
 
View Voting Results: Smartest and Funniest


Oldest | « | 1 | 2 | » | Newest | Show all

 
2020-06-13 8:20:57 PM  
You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.
 
2020-06-13 8:35:06 PM  

red230: You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.


And it's a very boring little star
 
2020-06-13 8:37:40 PM  
It can't be slow if time pretty much stops

relatively it's instantaneous
 
2020-06-13 8:47:12 PM  

zepillin: It can't be slow if time pretty much stops

relatively it's instantaneous


If you interviewed a photon from Andromeda hitting your retina, it would tell you that it didn't travel anywhere, and no time had elapsed.  You can't get any quicker than that.
 
2020-06-13 8:47:47 PM  

red230: You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.


And every last photon it puts out has to hit something.
 
2020-06-13 8:48:14 PM  

red230: You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.


I forget where I saw it, but recently it was noted that if sound traveled in a vacuum, the noise the sun makes would be at a decibel level high enough to deafen everyone on earth.
 
2020-06-13 8:48:21 PM  
Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space
 
2020-06-13 8:51:39 PM  

Marcus Aurelius: zepillin: It can't be slow if time pretty much stops

relatively it's instantaneous

If you interviewed a photon from Andromeda hitting your retina, it would tell you that it didn't travel anywhere, and no time had elapsed.  You can't get any quicker than that.


Time, much like beauty, is in the eye of the beholder
 
2020-06-13 8:51:59 PM  

Marcus Aurelius: zepillin: It can't be slow if time pretty much stops

relatively it's instantaneous

If you interviewed a photon from Andromeda hitting your retina, it would tell you that it didn't travel anywhere, and no time had elapsed.  You can't get any quicker than that.


Andromeda!

Gorillaz - Andromeda (Purple Disco Machine Remix)
Youtube tW3J9XnBbqk
 
2020-06-13 8:53:52 PM  

Marcus Aurelius: zepillin: It can't be slow if time pretty much stops

relatively it's instantaneous

If you interviewed a photon from Andromeda hitting your retina, it would tell you that it didn't travel anywhere, and no time had elapsed.  You can't get any quicker than that.


if you can communicate with a point instantaneously it's not far away

it's here and now

closer than your computer screen
 
2020-06-13 8:59:58 PM  

zepillin: Marcus Aurelius: zepillin: It can't be slow if time pretty much stops

relatively it's instantaneous

If you interviewed a photon from Andromeda hitting your retina, it would tell you that it didn't travel anywhere, and no time had elapsed.  You can't get any quicker than that.

if you can communicate with a point instantaneously it's not far away

it's here and now

closer than your computer screen


66.media.tumblr.comView Full Size
 
2020-06-13 9:47:54 PM  

Marcus Aurelius: red230: You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.

And every last photon it puts out has to hit something.


I don't think so. Given that the universe is expanding at an increasing rate, some of those photons are headed toward matter that will eventually be receding faster than the speed of light relative to the point of origin of the photon.
This stuff gives me a headache if I think about it too much.
 
2020-06-13 9:56:31 PM  

Marcus Aurelius: zepillin: It can't be slow if time pretty much stops

relatively it's instantaneous

If you interviewed a photon from Andromeda hitting your retina, it would tell you that it didn't travel anywhere, and no time had elapsed.  You can't get any quicker than that.


OK, so that means that our whole solar system could be like one tiny atom in the fingernail of some other giant being. ... That means that one tiny atom in my fingernail could be..... could be one tiny little universe!
 
2020-06-13 10:06:39 PM  

revrendjim: Marcus Aurelius: red230: You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.

And every last photon it puts out has to hit something.

I don't think so. Given that the universe is expanding at an increasing rate, some of those photons are headed toward matter that will eventually be receding faster than the speed of light relative to the point of origin of the photon.
This stuff gives me a headache if I think about it too much.


I think he means the photon that's released in the fusion reaction in the core. The crazy thing is that it can take 100,000 years for a photon to reach the surface of the sun once it is emitted in the core.
 
2020-06-13 10:12:25 PM  
The Expanse book series explains this as well as I've seen.  It takes months for a ship to travel from Earth to Neptune.  It wouldn't even be possible, without the plot device of the Epstein Drive.  All it does is make engines more efficient, so they can accelerate longer and not have to carry as much fuel.  Otherwise, it would take years to get to Neptune and require so much fuel, it's not economically feasible.
 
2020-06-13 10:14:44 PM  
It's barely even a fraction of the speed of dark. Dark was already there before the big bang. That's how quick it is.
 
2020-06-13 10:24:26 PM  

foo monkey: The Expanse book series explains this as well as I've seen.  It takes months for a ship to travel from Earth to Neptune.  It wouldn't even be possible, without the plot device of the Epstein Drive.  All it does is make engines more efficient, so they can accelerate longer and not have to carry as much fuel.  Otherwise, it would take years to get to Neptune and require so much fuel, it's not economically feasible.


It also frees them from the boring constraints of Hohfmann transfers.

You can just point where you want to go and burn. Then point away from where you want to go and burn.
 
2020-06-13 10:24:49 PM  
Fark user imageView Full Size
 
2020-06-13 10:41:23 PM  
The sun's light takes 8 minutes to get to us.

The fastest thing we've ever sent into space is only 17 light hours away. We sent it 40ish years ago.

If the Moon Were Only 1 Pixel
 
2020-06-13 11:01:45 PM  

GregoryD: The sun's light takes 8 minutes to get to us.

The fastest thing we've ever sent into space is only 17 light hours away. We sent it 40ish years ago.

If the Moon Were Only 1 Pixel


And all the matter we're made up of is even more empty space than the solar system

The scale of the Atom
Youtube AUikssuW_OQ
 
2020-06-13 11:06:52 PM  

whither_apophis: red230: You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.

And it's a very boring little star


It's a nice star!  I like it!
 
2020-06-13 11:31:31 PM  
Not if you want to go to a galaxy far, far, away.
 
2020-06-14 12:33:52 AM  

bloobeary: red230: You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.

I forget where I saw it, but recently it was noted that if sound traveled in a vacuum, the noise the sun makes would be at a decibel level high enough to deafen everyone on earth.


I read somewhere (either from here, or I am totally making up the memory) that when deaf people are able to hear for the first time, some of them thought that the Sun made some kind of noise.

Always found that piece of (possibly false) information extremely interesting.
 
2020-06-14 1:45:43 AM  

Marcus Aurelius: zepillin: It can't be slow if time pretty much stops

relatively it's instantaneous

If you interviewed a photon from Andromeda hitting your retina, it would tell you that it didn't travel anywhere, and no time had elapsed.  You can't get any quicker than that.


this would be true if the speed of light was walking speed. celerity is one hell of a drug
 
2020-06-14 1:53:05 AM  
Riding Light did it better.

https://youtu.be/1AAU_btBN7s
 
2020-06-14 2:31:24 AM  
I don't believe space is real.
 
2020-06-14 2:33:24 AM  

Dear Jerk: I don't believe space is real.


Hoarder like typing detected.
 
2020-06-14 2:35:41 AM  
This one is better.

Riding Light - Traversing the Solar System at the speed of light
Youtube 1AAU_btBN7s


It even goes to the outer planets.
 
2020-06-14 2:49:58 AM  
Aw C'mon -- no Galaxy Song references...?

Just remember that youre standing on a planet thats evolving and revovling at 900 miles per hour....
 
2020-06-14 2:50:46 AM  

red230: You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.


Yeah , space is big. Stuff is far.

Geo,Video FAR
Youtube dF2HG1PVZok
 
2020-06-14 2:59:41 AM  

whither_apophis: GregoryD: The sun's light takes 8 minutes to get to us.

The fastest thing we've ever sent into space is only 17 light hours away. We sent it 40ish years ago.

If the Moon Were Only 1 Pixel

And all the matter we're made up of is even more empty space than the solar system

[Youtube-video https://www.youtube.com/embed/AUikssuW​_OQ]


If you took all the atoms that every human who ever lived is made of and removed that empty space, all the actual "stuff" left over would be the size of a sugar cube.
 
2020-06-14 4:20:48 AM  

GregoryD: whither_apophis: GregoryD: The sun's light takes 8 minutes to get to us.

The fastest thing we've ever sent into space is only 17 light hours away. We sent it 40ish years ago.

If the Moon Were Only 1 Pixel

And all the matter we're made up of is even more empty space than the solar system

[Youtube-video https://www.youtube.com/embed/AUikssuW​_OQ]

If you took all the atoms that every human who ever lived is made of and removed that empty space, all the actual "stuff" left over would be the size of a sugar cube.


Yeah,

But how much would that sugar cube weight?
 
2020-06-14 4:27:35 AM  

MurphyMurphy: Yeah,

But how much would that sugar cube weight?


That depends, were those humans witches?
 
2020-06-14 4:28:42 AM  
DARA - Rodena Takava (Official 4k)
Youtube XuHSmAw2jrU
 
2020-06-14 5:14:18 AM  
bloobeary: ... I forget where I saw it, but recently it was noted that if sound traveled in a vacuum, the noise the sun makes would be at a decibel level high enough to deafen everyone on earth.

Fark user imageView Full Size


/sure, you can calculate a theoretical energy density were it somehow magically transmitted, but gaaaawwwww
 
2020-06-14 5:18:22 AM  

Marcus Aurelius: red230: You just can't comprehend how much space is in space or how powerful things are. Take the sun for example. The amount of energy that it puts out every second is incomprehensible. It is 93,000,000 miles away from you and it would burn your skin to a crisp if we weren't shielded by the atmosphere. It does this for a surface area of 10,900,000,000,000,000 square miles.

And every last photon it puts out has to hit something.


Most just hit Subby's mom, though.
 
2020-06-14 7:06:28 AM  
At least we can solve some of the latency problems if we bore holes straight through the Earth to run cables. Can't dig holes in space.
 
2020-06-14 7:18:39 AM  

Nullav: At least we can solve some of the latency problems if we bore holes straight through the Earth to run cables. Can't dig holes in space.


encrypted-tbn0.gstatic.comView Full Size


You watch me.
 
2020-06-14 8:20:59 AM  
Space is a prison. We're trapped where we are. Science fiction sets us free.
 
2020-06-14 8:31:22 AM  
It isn't "slow" at all, if you travel with it, you get everywhere in zero time.
 
2020-06-14 9:06:56 AM  

foo monkey: The Expanse book series explains this as well as I've seen.  It takes months for a ship to travel from Earth to Neptune.  It wouldn't even be possible, without the plot device of the Epstein Drive.  All it does is make engines more efficient, so they can accelerate longer and not have to carry as much fuel.  Otherwise, it would take years to get to Neptune and require so much fuel, it's not economically feasible.


You could do that with nuclear pulse propulsion, something we could technically build today.   Top theoretical speed is about 0.1c.  If you assume just 1/10th that, or 0.01c, it would only take you....  (whips out slide rule)

About 17 days to get to Neptune's orbit.

Neptune orbits at 30 AU, and the Earth at 1 AU.  So the distance will be at most 31 AU and at least 29 AU.  Light travels at, very approximately, 8 minutes per AU.  So light takes 8 * 30 = 240 minutes to get to Neptune from 30 AU.  Multiplying that by 100 gets us 24,000 minutes, or 400 hours, or 16.67 days.

In practice, you need time to accelerate at the start and decelerate at your destination, so probably more like 20 days.
 
2020-06-14 9:18:16 AM  
A more precise calculation with 499 seconds per AU for the speed of light gives us 49,900 seconds to traverse 1 AU at 0.01c, which is 1,497,000 seconds for 30 AU, or 24,950 minutes, 415.83 hours, or about 17.3 days, not including acceleration and deceleration time.

Not bad, without even looking anything up I was only off by less than a day.
 
2020-06-14 9:26:52 AM  

Nullav: At least we can solve some of the latency problems if we bore holes straight through the Earth to run cables. Can't dig holes in space.


You don't save all that much in latency.

A path around the Earth is at most just Pi / 2 = 1.57 times longer than one that goes directly through the Earth.
 
2020-06-14 9:53:37 AM  

Destructor: Space is a prison. We're trapped where we are. Science fiction sets us free.


Love is a battlefield.
 
2020-06-14 9:58:32 AM  

dittybopper: Destructor: Space is a prison. We're trapped where we are. Science fiction sets us free.

Love is a battlefield.


thedarksidemagazine.comView Full Size


Magic sets us Free.

The Great and Secret Show. (Clive Barker) Frankly, it's tough slogging and I wouldn't necessarily recommend it. But it's an interesting premise. I don't want to give anything away. I've already said too much.
 
2020-06-14 10:35:35 AM  

Marcus Aurelius: If you interviewed a photon from Andromeda hitting your retina, it would tell you that it didn't travel anywhere, and no time had elapsed.  You can't get any quicker than that.


The Four Velocity strikes again.  Also why gravity causes acceleration.

For those that don't know, there is a quantity in General Relativity called the Four Velocity.  The Four Velocity is the sum of the velocity vectors in the X, Y, Z, and T axes, and it's a constant.  The absolute magnitude of the Four Velocity is always c, which means everything is always going the speed of light, at least in total.  If you're not going very fast in space then you are going very fast in time, and vice versa.  For some thing that is going the speed of light through space, by necessity it must be going at 0 velocity in the time-like direction, i.e. time does not move for them.  If something enters a gravitational field, the gravity causes time dilation, time slows down, this requires a corresponding increase in the spatial velocity vectors, and due to the nature of the math, this will always be towards the greatest increase in the gravitational field.
 
2020-06-14 11:05:34 AM  
How impressed are we supposed to be with a video showing how much time it takes light to reach Mars? We've known since grade school that it takes 8 minutes for light to reach us from the sun. How is a video animating that going to increase our understanding of time?
 
2020-06-14 11:05:53 AM  

LrdPhoenix: you are going very fast in time


especially as you get older
 
2020-06-14 12:12:02 PM  
The problem isn't that light is to slow, it's that our lives are too fast.  If we could slow down our rate of experiencing the Universe by a factor of one million (thus increasing our lifespan by a factor of a million, although we wouldn't notice it since we're moving so slowly), for example, then a trip from the Sun to Alpha Centauri and back at the speed of light would take place within a "minute" or so.

Of course, we would not experience it taking a "minute"; for us it would be no time at all.  But folks on Earth watching us leave and return would note that we had not aged during that "minute".  Keep going further out and back, and the relativistic aging gap gets greater and greater, which would lead to all sorts of weirdness that we probably couldn't fathom.
 
2020-06-14 12:26:16 PM  
I like to imagine that one light year is one meter long. At that scale the solar system is about 1mm diameter and the nearest start is about 12 feet away. And at that scale, the galaxy is about the area that a large metropolitan area occupies, 60 miles in diameter or so. Truly enormous when you consider how slow light really is in human perception.
 
Displayed 50 of 74 comments


Oldest | « | 1 | 2 | » | Newest | Show all


View Voting Results: Smartest and Funniest

This thread is closed to new comments.

Continue Farking





On Twitter



  1. Links are submitted by members of the Fark community.

  2. When community members submit a link, they also write a custom headline for the story.

  3. Other Farkers comment on the links. This is the number of comments. Click here to read them.

  4. Click here to submit a link.