- 4097 - LIGHT - how fast does it travel? Light travels vast but space has enormous distances. By the way Andromeda Galaxy is the farthest thing you can see with the naked eye. Check it out. It too 2.5 million years to reach your eyes.
------------------ ---
4097 - LIGHT
- how fast does it travel?
-
--------------------
Light travels at 657,633,500 miles per hour.
-
-------------------- Light
travels at 186,237 miles per second.
-
- Light travels slower in
other medium, or appears to. It really
only travels at light speed but in other media it can be absorbed and
re-emitted so it appears to be traversing the medium at a slower speed. Light only has 2 speeds. zero or “light speed”.
-
- If you see a bolt of
lighting and you want to know how far away the lightning struck, you count, 1
second, 2 seconds, 3 seconds, 4 seconds and then the clap of thunder. You waited 4 seconds for the sound to reach
you.
-
-----------------------
Sound travels at 750 miles per hour.
-
-----------------------
Sound travels at 0.208 miles per second.
-
-----------------------
Sound travels 1100 feet per second.
-
-----------------------
So, the lighting strike is
8/10ths of a mile away.
-
-----------------------
Meanwhile the lightning has traveled 745,000 miles.
-
- The Moon is 239,000 miles
away so the light would have traveled to the Moon, reflected and traveled back
to Earth, re-reflected and traveled back to the Moon while you were waiting to
hear the thunder.
-
- If you were on the Moon
you would see the lightning in 2 seconds, but you would wait 13 days for the
thunder to arrive.
-
- Ok, I know, sound can not travel through outer
space, so, in fact you would never hear the thunder. The Moon has no atmosphere so there is no
sound on the Moon. We intrepret sound as
what our ears can hear. Actually, sound
is a density wave that our ears are sensitive to and it needs a medium like air
to travel through. However, to destroy a
myth, outer space is full of sound waves, called “density waves”.
-
- The density waves in
space are very important to the evolution of our Universe. The sound waves detected in the Cosmic
Microwave Background radiation allowed astronomers to calculated the age of the
Universe, 13.75 billion years old.
-
- The harmonics in the
sound wave allowed the calculation of the composition of the Universe to be 73%
Dark Matter, 23% Dark Energy, 5%
Ordinary Matter. All that we know and
understand lies in that little 5%.
Density waves are responsible for creating the structure of the galaxies
throughout the Universe. Sound waves are
responsible for the birth of stars.
-
- Back to that light that
left the lighting bolt. It would take 4
hours of the light to reach Neptune. If
we had a spacecraft there we would need to send the radio signal 4 hours early
before it told the spacecraft what to do.
Then we would have to wait another 4 hours for the spacecraft to tell us
that it did it.
-
------------- Neptune is 30
Astronomical Units from the Sun.
-
------------- We are 1 AU.
-
------------ 1 AU is 93
million miles.
-
------------ Light travels
11,200,000 mils per minute.
-
----------- It takes light
242 minutes to get there 29 AU away.
-
- To communicate to the
nearest star we would have to send the message 4.3 years in advance.
-
- To get to the Andromeda
Galaxy we would need to send it 2,500,000 years in advance, and then wait that
long for a response.
-
-
July 17, 2023 LIGHT
- how fast does it travel? 1386
4097
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--- to: ------
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------ “Jim Detrick” -----------
--------------------- ---
Tuesday, July 18, 2023 ---------------------------------
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