Radio Waves and Snowflakes

In a 1980 television show, popular astronomer Carl Sagan said, “All of the radio waves from space ever studied equal less than the power of a single snowflake hitting the ground.”

That wasn’t quite true then, but it was close. Today, with many more radio telescopes and many more years of collecting astronomical radio waves, the total power of all the waves studied from space is still much less than the energy your body used while you read this post.