Describe a method that you could use to determine the relative distances of the Virgo Cluster and the Hercules Cluster (as in how many times further one cluster is compared the other). There are several ways of doing this. Be sure to state any assumptions necessary for your method to work.

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.