Calculateur de Distance Comobile
Calculez la distance comobile d'un objet cosmologique.
Comoving Distance
428.2857 Mpc
Comoving Distance vs Redshift (z)
Formule
Comoving Distance Approximation
At low redshifts the comoving distance is well approximated by the linear Hubble relation.
Formula
d = c z / H0
The result is in Mpc. For z above about 0.3, higher-order corrections become important.
Exemple Résolu
A galaxy at redshift z = 0.1 with H0 = 70 km/s/Mpc.
- 01d = c z / H0
- 02d = 299800 * 0.1 / 70
- 03d = 29980 / 70
- 04d ≈ 428.3 Mpc ≈ 1396 Mly
Questions Fréquentes
What is comoving distance?
It is the distance between two objects measured in a reference frame that expands with the universe. It remains constant as the universe grows.
When does this linear approximation break down?
For redshifts above about 0.3, the non-linear effects of the expansion history (matter and dark energy content) become significant.
How does comoving distance differ from luminosity distance?
Luminosity distance accounts for the dimming of light due to expansion: d_L = d_comoving * (1 + z). It is always larger than the comoving distance.