The "Cold Spot" is approximately 70 µK (0.00007 K) colder than the average CMB temperature (approximately 2.7 K), whereas the root mean square of typical temperature variations is only 18 µK.
How large is the CMB?
The Cosmic Microwave Background was emitted when the Universe was about 400000 years old. When this happened, the size of what is visible now was about 1000 times smaller than it is now, or about 100 million light years across.
Where is the CMB cold spot?
The Cold Spot (CS) in the cosmic microwave background (CMB) map is an unusually cold and large region, located at (l, b) ∼ (208°, −57°) with the mean temperature decrement ΔT ≈ −150 μK in a 5° radius, and is among the robust large-scale CMB anomalies.
How cold is the CMB?
2.7 K. The CMB as we detect it today has been stretched to its current microwave wavelength due to the universe's expansion, and cooled to a temperature of just 2.7 K.
How big is the Eridanus Supervoid?
1.8 billion lightyears This finding confirms the existence of the Eridanus supervoid with an independent probe! The authors also found that the Eridanus supervoid, which is 20% less dense than the cosmic average and extends over 1.8 billion lightyears, is the most prominent void in the whole DES data set.
What is the redshift of the CMB?
Light from the CMB is redshifted as the universe expands, cooling it over time. The CMB is a perfect example of redshift. Originally, CMB photons had much shorter wavelengths with high associated energy, corresponding to a temperature of about 3,000 K (nearly 5,000° F).
How is CMB measured?
For this measurement of the CMB temperature, the equipment consists of a receiver for 10 GHz which receives the signal, a series of amplifiers that amplify the signal, which is then converted to a voltage reading (a few milli Volt typically) on screen.
What is the largest void in the universe?
Radio astronomers have found the biggest hole ever seen in the universe. The void, which is nearly a billion light years across, is empty of both normal matter and dark matter. The finding challenges theories of large-scale structure formation in the universe.
How big is the observable universe?
46.508 billion light years Observable universe/Radius