Search "+Drake equation"
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- 0.200 + - 2016
- 0.200 + - April 28
- 0.200 + - Milky Way
- 0.200 + - Frank Drake
- 0.200 + - Carl Sagan
- 0.025 + - November 9
- 0.025 + - 칼 세이건
- 0.025 + - Science
- 0.025 + - December 20
- 0.025 + - United States
- 0.025 + - Contact
- 0.025 + - 1934
- 0.025 + - Cosmos: A Personal Voyage
- 0.025 + - Cosmos
- 0.025 + - 1996
- 0.013 + - May 19
- 0.013 + - November 23
- 0.013 + - July 11
- 0.013 + - Chaos
- 0.013 + - November 6