Question

Explain what we mean when we say that Hubble’s constant is between 20 and 24 kilometers per second per million light-years

Answer 1

The Hubble constant is a constant which helps us understand how the universe expands since the big bang. When we say the Hubble constant is between 20-24 km per second per million light years, we mean that for each million light year distance away from us , a galaxy speed is around 20-24 km/sec.