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Since light travels at 670,616,629 mph, and theres 24 hours in a day and 365 days a year, gonna be hard to get that many digits on a calculator, but its a loooooooooooong way.
The Shop
https://twitter.com/NASA/status/1117171787186548738
Earth is 8.3 light minutes from the sun.
In the course of their experiments with the speed of light,
physicists discovered something very strange The speed of
light disregards the transformation laws of classical mechanics
Of course, that's impossible, but nevertheless, experiment
after experiment proved just the opposite The speed of light
just happens to be the most nonsensical thing ever discovered
That is because it never changes
'So light always travels at the same speed," we ask, \vhat s
so strange about thatl>"
"Oh mv, oh my, ' says a distraught phvsicist circa 1887
"you simply don't understand the problem The problem is
that no matter what the circumstances of the measurement,
no matter what the motion of the observ er, the speed of light
always measures 186,000 miles per second ' *
"Is this bad?
" we sav, beginning to sense that something is
strange here
"Worse," says the physicist "It's impossible Look," he
tells us, trying to calm himself, "suppose that we are standing
still and that somewhere in front of us is a light bulb that also
is standing still The light bulb flashes on and off and we
measure the velocity of the light that comes from it What do
you suppose that velocity \vill be?
"
"186,000 miles per second, we answer, "the speed of light
"Correct'" savs the physicist, with a knowing look that makes
us uncomfortable "Now, suppose the light bulb still is standing
still, but we are moving toward it at 100,000 miles per second
Now what will we measure the speed of the light tobe^"
286,000 miles per second,' we answer ' the speed of light
(186,000 miles per second) plus our speed (100 OXX) miles per
second) " (This is a typical example of a classical transformation)
"Wrong1
" shouts the physicist "That's just the point The
speed of the light is still 186,000 miles per second "
"Wait a minute," we sav "That can t be You sav that if the
light bulb is at rest and we are at rest, the speed of photons
* In a vacuum Trit bpeed ol light changes in matter depending upon tht index
of refraction of the matter c,,wttt< r = ——————————— index of refraction
128 /NONSENSE
emitted from it will measure the same to us as the speed of
photons emitted from it when we are rushing toward the light
bulb? That doesn't make sense. When the photons are emitted,
they are traveling at 186,000 miles per second. If we also are
moving, and moving toward them, their velocity should measure that much faster. In fact, they should appear to be traveling
with the speed at which they were emitted plus our speed.
Their velocity should measure 186,000 miles per second plus
100,000 miles per second."
"True," says our friend, "but it doesn't. It measures 186,000
miles per second, just as if we still were standing still."
Pausing for that to sink in, he continues, "Now consider the
opposite situation. Suppose that the light bulb still is standing
still, and this time we are moving away from it at 100,000
miles per second. What will the velocity of the photons measure now?
"86,000 miles per second?" we say, hopefully, "the speed of
light minus our speed as we move away from the approaching
photons?"
"Wrong, again!" exclaims our friend again. "It should, but
it doesn't. The speed of the photons still measures 186,000
miles per second."
"This is very hard to believe. Do you mean that if a light
bulb is at rest and we measure the speed of the photons
emitted from it while we also are at rest, and if we then
measure the speed of the photons from it while we are moving toward it, and lastly, if we measure the speed of the
photons emitted from it while we are moving away from it,
we get the same result in all three cases?"
"Exactly!" says the physicist. "186,000 miles per second."*
"Do you have any evidence?" we ask him.
Unfortunately, he says, "I do. Two American physicists.
Albert Michelson and Edward Morley, have just completed
an experiment which seems to show that the speed of light is
constant, regardless of the state of motion of the observer."
Pit Row
1. Develop tech to travel thru wormhole to other side of the galaxy
2. Bring high powered telescope
3. And basically peak back in time
(Would never work tho. The image that existed 65m yrs ago would be so out of focus right?)
https://en.wikipedia.org/wiki/Observable_universe
Some parts of the universe are too far away for the light emitted since the Big Bang to have had enough time to reach Earth or its scientific space-based instruments, and so lie outside the observable universe. In the future, light from distant galaxies will have had more time to travel, so additional regions will become observable. However, due to Hubble's law, regions sufficiently distant from the Earth are expanding away from it faster than the speed of light (special relativity prevents nearby objects in the same local region from moving faster than the speed of light with respect to each other, but there is no such constraint for distant objects when the space between them is expanding; see uses of the proper distance for a discussion) and furthermore the expansion rate appears to be accelerating due to dark energy. .....
But I could imagine two objects moving apart from each other, gaining speed until the combined rate (2 objects just moving at half the speed of light) would mean they were outrunning each other.
Traversable Wormholes Can Exist, But They Are Not Very Useful for Space Travel, Physicists Say:
http://www.sci-news.com/physics/traversable-wormholes-07092.html
Post a reply to: Black Hole Photographed For The First Time