![I think it quite likely that we are the only civilization within several hundred light years; otherwise we would have heard radio waves. I think it quite likely that we are the only civilization within several hundred light years; otherwise we would have heard radio waves.](http://img.enquoted.com/i-think-it-quite-likely-that-we-are-the-only-civilization-within-several.webp)
I think it quite likely that we are the only civilization within several hundred light years; otherwise we would have heard radio waves.
civilization hear hundred
These are some quotes by English author Stephen Hawking Physicist, who was born on January 8, 1942.