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sci.cosmological-redshift Calculator
Calculates cosmological redshift z = (λ_observed − λ_emitted)/λ_emitted and the corresponding recession velocity and lookback time. A galaxy at z = 1 has its light stretched to twice the emitted wavelength — the cosmic microwave background at z ≈ 1,100 was emitted 380,000 years after the Big Bang.
Inputs
Observed Wavelength Nm
Distance between successive wave crests. Related to frequency: λ = speed / frequency.
Emitted Wavelength Nm
Distance between successive wave crests. Related to frequency: λ = speed / frequency.
Hubble Constant Kms Mpc
Reference formula or conversion factor shown for context.
Results
redshift z
Doppler shift of light toward longer wavelengths due to recessional velocity. z = 1 means the universe has doubled in size since the light was emitted.
recession velocity (km/s)
Sample size or count used in the calculation.
Hubble distance (Mpc)
The computed distance or separation.
lookback time (approx Gyr)
The computed duration or time value.
z = Δλ/λ_emit
Reference formula or conversion factor shown for context.
CMB photons
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).