Then, comparing the angular expansion with the known expansion velocity, the distance to the nebula can be calculated.

Its angular expansion rate is 3.457 milliarcseconds per year, while its expansion velocity along the line of sight has been found to be 16.4 km/s.

"If we can define the expansion velocity of the universe, that's enough, and I'm sure we'll do much more."

The more distant galaxies have a higher expansion velocity and thus a higher red shift.

It has an expansion velocity of around 1000 km/s, and has a lifetime of a few centuries.

A typical expansion velocity is about 20 km s-1.

The low expansion velocity of SN2008ha resulted in relatively small Doppler broadening of spectral emission lines and this led to higher quality data.

They have relatively slow expansion velocities of 200-1000 km/s and total radiated energies are 10 to 10 J.

In 1970, Bohuski, Smith, and Weedman found an expansion velocity of 31 km/s.

A comparison of that rate, which applied early in time, with the current expansion velocity should show how much the universe is slowing down.