Cosmic Adventure 3.9-10 World of Finite Light Speed

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IMAGE CARRIERS

Cosmic Adventure 3.09


An Object Emits or Reflects Light

Every object in this universe either emits or reflects light.


Light & Vision

We can see an object because its light brings the images to our eyes. Light is the visual image carrier in our lives.


Our eyes intercept the light and interpret them as the images in our mind. This is the way how we can see.


Image Carriers

In such a way, light is serving as the carrier of images, bringing us the enjoyment of vision.


Speed of Light too Fast

Light travels at a speed of about 300,000,000 meters per second.

This is an astronomical figure. There is nothing in our daily life that comes anywhere near to it.

For example, the speed of sound is only 343.2 meters per second; even supersonic speeds of 5 or six times greater than the speed of sound are only about 1,500 meters per second.


Light too fast to be Detected

In ordinary life, light is so fast that this delay is not perceptible. To cover a distance of one meter, light only takes about 3 × 10−9 second.

Even in the larger scale, light takes only 1 second to circle the earth ten times.

That is why when Galileo Galilee tried to measure the speed of light using crude equipment, he could not find anything.


26.8

70

100

770

13,000

66,641

671,000,000

0.1 1 10 100 1000 10000 100000 1000000

Light

Earth

Jet

Sound

Baseball

Cheetah

FastestRunner

Speed in miles per hourSpeed in km per hour

109,870,000

107,244

20,921

1,239

161

113

43

Comparison of Some Speed Samples


DELAY IN IMAGE DELIVERY



Light Takes Time to Travel

But no matter how fast light travel, it still needs time to cover a distant, no matter how small the distance is. For an object one meter away, light from it takes 3.3 nanoseconds (10-9 second to reach our eyes; for an object one kilometer away, light from it takes 3.3 microseconds to reach our eyes. (A microsecond is a unit of time equal to one millionth or 10-6 of a second.)


Delayed Vision

This means that by the time light from an object reaches our eye, some length of time must have elapsed. This is the delay of image delivery.

𝑇𝑖𝑚𝑒 = ∆𝑡


In the astronomical scale, the difference is more appreciable. Take for example, the moon is 384,400 km away from the earth and the speed of light is 299,799 km per second. The time taken for its light to reach earth is:

384,400 𝑘𝑚

299,799 𝑘𝑚/𝑠𝑒𝑐𝑜𝑛𝑑= 1.28 𝑠𝑒𝑐𝑜𝑛𝑑

About 1.28 𝑠𝑒𝑐𝑜𝑛𝑑


The light from the sun, which is about 3 × 1011

metres away, will take light to travel about 8 minutes in space before reaching earth.

About 8 minutes


Another example: The galaxy of Andromeda is 2,538,000 light years away from the earth. A light year is the time taken for light to travel in one year – covering about 9 trillion kilometers (about 6 trillion miles). This is the time in years needed for its light to reach earth.

2,538,000 𝐿𝑖𝑔ℎ𝑡 𝑦𝑒𝑎𝑟𝑠


Remember how Römer discovered the speed of light due to the delay in time obvious in astronomical observation?

Ole Römer Discovered the speed of Light

Jupiter

Io

Earth moving towards Jupiter

Io hides behind Jupiter and becomes invisible

Earth moving away from Jupiter


Time & Distance Gap

What we see are only images delivered to our eyes by light coming from a source some time ago. In general, there is always a time delay in messages which need light as a carrier, no matter how short the distance is between the observer and the observed.

Observer Observed


𝒄

So distant objects are all old ones at various time in the past.


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in m

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in m

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sSEQUENCES OF IMAGES

Optical Phenomena due to the Finite speed of light


𝑑 = 𝑣𝑡

Classical Position in Infinite Light Speed

The actual position of a moving object is now not what they appear to be because it take time for light to carry their images to the observer

𝑣

Image


Universe in Antiquity

The proper time and place for the heavens beyond the clouds are now trillions of years away from us and their images will take trillions of years to reach our eyes.

Trillion light years away

Light years away

Nano seconds away


Universe with Finite Light Speed

Now the scenes appearing in front of us are all layered in time. The oldest scenes appear at the farthest.


Layers of Spheres

Because of the finite nature of light speed, our world is actually made up of lays of time spheres


Multi-Time Universe

With the idea of finite light speed confirmed, we now know that we are living in a world of multiple-time layers. That is what appears to us is a universe made up of scenes from different times.

This is an universal phenomenon. It happens to to all things, everywhere in this universe, large or small.


EINSTEIN, RELATIVITY, AND VISONICS


Cosmic Adventure 3.9-10 World of Finite Light Speed

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Transcript of Cosmic Adventure 3.9-10 World of Finite Light Speed