When the road turns blue in front of you, chances are the winds don't blow and the temperatures are high.
The road's surface heats up and becomes a stove to the air immediately above it. The hot air is thinner than the cooler air further above, winds don't mix the two, and the border turns into a mirror. We see the — blue — sky above reflected in it.
Now, the air just above the moon's surface is really, really thin; possibly, one can see the — blue — earth reflected on it.
›› Earth is a marvelous planet. (IncrediMail)