Lesson: Hubble's Law
In this lesson, we will learn how to use the formula v = H₀d (Hubble's law) to calculate the distance to faraway galaxies using the recession velocity.
Sample Question Videos
Worksheet: 7 Questions • 3 Videos
What is 240 000 ly in megalight-years?
The Whirlpool Galaxy is 23 million light years away from Earth. Using a value of 20.8 km/s/Mly for the value of the Hubble constant, find the value of the radial velocity of the Whirlpool Galaxy. Give your answer to 2 significant figures and in units of kilometers per second.
The Hubble constant is an important constant in astronomy. It is often measured in units of kilometers per second per megalight-year.
Which of the following units could the Hubble constant also be expressed in?