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Observable-universe
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How many states are there in the observable universe?
November 23rd, 2021
estimation
observable-universe
quantum-information
entropy
universe
Can the coordinate of the big bang point be calculated via observed universe or it is impossible?
May 14th, 2020
big-bang
space-expansion
cosmology
observable-universe
universe
Understanding the CMB background as a reference frame
April 12th, 2022
cosmology
reference-frames
astronomy
cosmic-microwave-background
observable-universe
Is "speed relative to the universe" a well-defined concept?
August 26th, 2021
cosmology
coordinate-systems
observable-universe
reference-frames
universe
Can light reach far away galaxies in an expanding universe?
December 10th, 2020
general-relativity
observable-universe
space-expansion
speed-of-light
cosmology
Will the CMB ever stop shining?
November 24th, 2020
cosmic-microwave-background
observable-universe
cosmology
If we were able to prove that the universe is infinite, wouldn't that statistically prove that there is no other forms of life?
March 25th, 2022
statistical-mechanics
observable-universe
universe
cosmology
The difference between comoving and proper distances in defining the observable universe
August 1st, 2022
cosmology
distance
observable-universe
spacetime
space-expansion
Is the temperature of the universe rising?
December 10th, 2020
temperature
observable-universe
universe
space-expansion
cosmology
As the universe ages, will we see more stars or less?
August 1st, 2022
space-expansion
cosmology
universe
observable-universe
Why is the sky dark at night?
July 29th, 2020
cosmology
visible-light
everyday-life
stars
observable-universe
Could the observable universe be bigger than the universe?
April 4th, 2021
observable-universe
cosmology
universe
Ambiguity in applying Newton's shell theorem in an infinite homogeneous universe
August 1st, 2022
observable-universe
thought-experiment
symmetry
newtonian-gravity
cosmology
How would the night sky appear at the edge of the galaxy?
January 16th, 2020
astronomy
galaxies
observable-universe
How far away is Cosmic Background Radiation?
September 12th, 2020
cosmology
observable-universe
cosmic-microwave-background
big-bang
How long would it take to see the nearest star die?
October 13th, 2020
astronomy
stars
observable-universe
speed-of-light
Non-observable universe vs last scattering surface
November 18th, 2020
observable-universe
cosmic-microwave-background
cosmology
What kind of accuracy could one get with Pi to 40 decimal places?
May 11th, 2020
observable-universe
What are we all falling towards?
August 1st, 2022
cosmology
observable-universe
space-expansion
gravity
How can the universe be dodecahedron-shaped?
August 1st, 2022
general-relativity
observable-universe
spacetime
cosmology
special-relativity
Can we observe an edge of the universe?
August 1st, 2022
universe
observable-universe
What is the most common photon wavelength in our observable universe (not including the Sun)?
August 1st, 2022
observable-universe
wavelength
frequency
photons
visible-light
Size of the Observable Universe
August 1st, 2022
observable-universe
cosmology
universe
space-expansion
faster-than-light
The location of the exact center of the observable universe
August 1st, 2022
observable-universe
general-relativity
cosmology
reference-frames
big-bang
Is the universe bounded?
August 1st, 2022
observable-universe
cosmology
spacetime
universe
big-bang
What's the total Cosmic Microwave Background energy?
April 19th, 2020
cosmic-microwave-background
observable-universe
Why is CMB not considered as the edge of the universe?
August 1st, 2022
cosmology
observable-universe
cosmic-microwave-background
How can we know there is more than just the observable universe
August 14th, 2020
observable-universe
universe
Difference between causal horizon and particle horizon
March 2nd, 2020
observable-universe
universe
cosmological-inflation
cosmology
Total positive energy in the (observable) universe
May 22nd, 2020
data
universe
astronomy
energy
observable-universe