learn.howToCalculate
learn.whatIsHeading
Redshift (z) measures wavelength increase due to cosmic expansion or relative motion. Higher z indicates greater distance or recession speed.
Formel
Calculate z = (λ_obs - λ_rest) / λ_rest
- z
- (λ_obs - λ_rest) / λ_rest — (λ_obs - λ_rest) / λ_rest
Steg-för-steg-guide
- 1Input observed and rest wavelengths
- 2Calculate z = (λ_obs - λ_rest) / λ_rest
- 3Estimate distance using Hubble constant
Lösta exempel
Ingång
z = 0.1
Resultat
Recession velocity ~10,000 km/s, distance ~400 Mpc
Using H₀ = 70 km/s/Mpc
Vanliga misstag att undvika
- ✕Confusing Doppler redshift with cosmological redshift
- ✕Using non-relativistic formulas for high z
Vanliga frågor
Does redshift mean object moving away?
Usually yes, but expansion also redshifts distant objects even in static space.
Redo att beräkna? Prova den kostnadsfria Redshift-kalkylatorn
Prova själv →