Download Recessional Velocity Of Galaxies Images. I need to express my answer in km, distance in speed, age of the universe in seconds. Velocity dispersion measurements of galaxies.

An Alternate View Redshift Distance Vs Time
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The space between the galaxies is actually stretching and growing (like the balloon). Galaxies do not obey hubble's law exactly, because they have velocities of their own, in addition to their recessional velocity. Calculate the amount of mass inside a sphere whose radius is at the distance.

Recessional velocity is the rate at which an extragalactic astronomical object recedes (becomes more distant) from an observer as a result of the expansion of the universe.

Take hubble's constant to be 20 km/s/mly. Recessional velocity is the rate at which an extragalactic astronomical object recedes (becomes more distant) from an observer as a result of the expansion of the universe. Thus the universe as a whole appears to be expanding, and it follows that the universe was denser in the past. And the hubble law b.