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sci.cosmological-redshift-scale-factor Calculator
Calculates cosmological redshift z = (λ_obs − λ_emit)/λ_emit and scale factor a = 1/(1+z) at the time of light emission. At z = 1, the universe was half its current size — galaxies at z > 7 are observed as they were less than 800 million years after the Big Bang.
Inputs
Z Redshift
Reference formula or conversion factor shown for context.
Results
scale factor at emission a(t_emit)
A dimensionless multiplier applied in the calculation.
wavelength stretch factor
A dimensionless multiplier applied in the calculation.
lookback time estimate (Gyr)
The computed duration or time value.
universe age fraction at emission
The value at the specified point or condition.
a(t) = 1/(1+z)
Reference formula or conversion factor shown for context.
notable redshifts
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.