- 4090 - COSMIC MICROWAVE BACKGROUND - 13.6B years old? Astronomers have a new kind of telescope called the “Murchison Wide-Field Array” installed in the remote desert of Western Australia. Potentially this telescope could look further back in time than the Cosmic Microwave Background, which is at 370,000 years after the Big Bang.
---- 4090 - COSMIC MICROWAVE BACKGROUND - 13.6B years old?
- The Murchison radio
telescope is located in the middle of the desert in Australia in order to avoid
FM radio interference. A side benefit
to all of this radio reception is that
these frequencies are also a likely radio band for alien civilizations to be
trying to communicate with us. You never
know, it could happen.
-
- The hydrogen atom
is the most abundant element in the Universe.
It is a proton with one electron.
When the electron jumps from an excited state to its ground state it
emit’s a particular wavelength of photon.
The photon is at 21 centimeters wavelength.
-
--------- frequency *
wavelength = the speed of light.
-
----------
frequency = 3*10^8 meters per second / 0.21 meters = 1400
MHz
-
- 1400 MHz is at
the edge of your FM radio dial. But,
that is the frequency emitted at the source.
The new radio telescope in Australia is tuned from 9 to 200 MHz because
a 21 cm hydrogen signal from the early Universe is redshifted form 1400 MHz to
this radio band.
-
- The wavelengths
of the radio band stretch from1500 centimeters to 3,300 centimeters. This corresponds to a redshift of 158 times
to 70 times the originating wavelength.
This means the radiation has traveled some 40 billion lightyears.
-
- The travel time
for the radiation was 13.6 billion years.
Which means the radiation left the source some 10 to 40 million years
after the Big Bang. The distance
traveled in lightyears is greater than the time elapsed because during that
time the Universe was expanding making the distance traveled greater.
-
- Here is a table of
the redshift distance, travel time and time since the Big Bang for various
redshifts:
-
---------
redshift --------------- Distance
--------------- Travel Time ---------
Time Since
---------------------------------- Billion lightyears -------Billion lightyears ------- Big Bang
-------------------------------------------------------------------------------------------- Billion years
-
----------- 1 -------------------------10.8 ---------------------7,.7 ------------------ 5.93
-------
----------- 2 -------------------------17.1 ---------------------10,3 ------------------ 3.34
-------
----------- 3 -------------------------21.1 ---------------------11.5
------------------ 2.19 -------
----------- 4 -------------------------23.8 ---------------------12.1
------------------ 1.57 -------
----------- 5 -------------------------25.9 ---------------------12.5
------------------ 1.19 -------
----------- 6 -------------------------27.5 ---------------------12.7 ------------------ 950
-------
----------- 7 -------------------------28.8 ---------------------12.9
------------------ 780 -------
----------- 8 -------------------------29.8 ---------------------13.0
------------------ 650 -------
----------- 9 -------------------------30.7 --------------------- 13.1
------------------ 560 -------
----------- 10 -------------------------31.5 ---------------------13.2 ------------------ 480 ------
----------- 15 -------------------------34.2 ---------------------13.4
------------------ 270 ------
-----------
20-------------------------35.9--------------------- 13.5--------------- 180-------
----------- 50 -------------------------40.0 ---------------------13.6------------------ 47
-------
----------- 100------------------------- 42.2--------------------- 13.65--------------- 17 -----
----------- 1000 -------------------------45.6
---------------------13.7------------------ 0.43
---
-
- This table assumes
that Dark Energy is 73% of the Universe and that Dark Matter is 23% of the
Universe. It assumes that the Hubble
Constant rate of expansion to be 71 kilometers per second per mega parsec. This is equivalent to 47,000 miles per hour
per million lightyears. And, it assumes
the age of the Universe to be 13.7 billion years.
-
(1) The radio
telescope is located in the middle of the desert in Australia in order to avoid
FM radio interference.
(2) A side benefit to
all of this radio reception is that
these frequencies are also a likely radio band for alien civilizations to be
trying to communicate with us. You never
know, it could happen.
-
-
July 13, 2023
COSMIC MICROWAVE - 13.6B years old? 925 4090
------------------------------------------------------------------------------------------
-------- 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, July 13, 2023
---------------------------------
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