![](http://3.bp.blogspot.com/-gx6RvBiYq9c/Th44iknoELI/AAAAAAAAGIg/GBpR1Vj5o2M/s400/radio_broadcasts.jpg)
I wonder this sometimes. This image explains in a powerful way why that might be; click on it and pause for a minute to reflect on what a tiny portion of our own galaxy would have been reached by radio waves broadcast from the earth. Our first radio broadcasts were made a century ago, and so could have traveled a hundred light years. The Milky Way is more than 100,000 light years across.
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