The universe is expanding at a rate quantified by the Hubble constant, which measures how fast galaxies recede from each other per unit distance. Current estimates of the Hubble constant range roughly between 67 and 73 kilometers per second per megaparsec (km/s/Mpc). This means that for every megaparsec (about 3.26 million light-years) of distance from Earth, galaxies appear to be moving away an additional ~70 km/s on average

. To put it simply:

• At 1 megaparsec away, a galaxy recedes at about 70 km/s.
• At 10 megaparsecs, it recedes at about 700 km/s.
• At very large distances (e.g., 13 billion light-years), the recession velocity approaches the speed of light.
• Beyond that scale, galaxies can appear to recede faster than light, but this does not violate relativity because it is space itself expanding, not objects moving through space

This expansion rate is not a fixed speed but a rate that increases with distance, reflecting the metric expansion of space. The exact value of the Hubble constant is still under active research, with some tension between measurements based on nearby objects (supernovae, Cepheids) and those based on the cosmic microwave background radiation

. In summary, the universe expands at about 70 km/s for every 3.26 million light-years of distance, and this expansion causes very distant galaxies to recede at speeds that can exceed the speed of light due to the stretching of space itself.