Calculateur de Distance de Hubble Gratuit
Calculez la distance d'un objet cosmologique à partir de son décalage vers le rouge et de la constante de Hubble.
Distance
100.00 Mpc
Distance vs Recession Velocity
Formule
## Hubble's Law **v = H0 × d** or equivalently **d = v / H0** - *v* = recession velocity (km/s) - *H0* = Hubble constant (≈70 km/s/Mpc) - *d* = distance in megaparsecs This linear relation holds well for galaxies not too far away (z < 0.1). For larger distances, cosmological models are needed.
Exemple Résolu
A galaxy recedes at 7 000 km/s with H0 = 70 km/s/Mpc.
- 01d = v / H0 = 7000 / 70 = 100 Mpc
- 02In Mly: 100 × 3.262 = 326.2 million light-years
Questions Fréquentes
What is the Hubble constant?
It measures the current expansion rate of the universe. Current estimates range from about 67 to 73 km/s/Mpc depending on the method.
Why is there a Hubble tension?
Measurements from the early universe (CMB) give H0 ≈ 67, while local distance-ladder methods give ≈73. The discrepancy is not yet resolved.
Does Hubble's law mean we are at the centre?
No. Every point in an expanding universe sees all other points receding. There is no centre.