- 4411
- SPEED OF
LIGHT - think about it, amazing! Light travels fast but space has enormous distances. Andromeda Galaxy is the farthest thing you
can see with the naked eye. Check it
out. It took 2.5 million years to reach
your eyes.
------------------------- 4411
- SPEED OF
LIGHT - think about it, amazing!
-
- I Had No Idea Light Traveled That Fast!
-
-
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 interpret 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. The 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.
-
--------------
Light travels fast 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 took 2.5 million
years to reach your eyes.
-
-
March 28, 2023 SPEED
OF LIGHT -
think about it, amazing! 4411
------------------------------------------------------------------------------------------
-------- Comments appreciated and Pass it on to
whomever is interested. ---
--- Some reviews are at: -------------- http://jdetrick.blogspot.com -----
-- email feedback, corrections, request for
copies or Index of all reviews
--- to:
------
jamesdetrick@comcast.net
------ “Jim Detrick” -----------
--------------------- --- Thursday, March 28,
2024
---------------------------------
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