2921 results in Planetary systems and astrobiology
2 - Rate of formation of stars suitable for the development of intelligent life, R*, 1961 to the present
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10 - Fraction of life-bearing planets on which intelligent life emerges, fi, 1961 to the present
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5 - Number of planets, per solar system, with an environment suitable for life, ne, pre-1961
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The Drake Equation
- Estimating the Prevalence of Extraterrestrial Life through the Ages
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7 - Fraction of suitable planets on which life actually appears, fl, pre-1961
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Preface
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Introduction
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14 - Length of time such civilizations release detectable signals into space, L, 1961 to the present
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- 02 July 2015, pp 270-297
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6 - Number of planets, per solar system, with an environment suitable for life, ne, 1961 to the present
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Afterword
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1 - Rate of formation of stars suitable for the development of intelligent life, R*, pre-1961
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4 - Fraction of stars with planetary systems, fp, 1961 to the present
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Dedication
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13 - Length of time such civilizations release detectable signals into space, L, pre-1961
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Acknowledgements
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Index
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Foreword
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8 - Fraction of suitable planets on which life actually appears, fl, 1961 to the present
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- 02 July 2015, pp 145-162
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12 - Fraction of civilizations that develop a technology that releases detectable signs of their existence into space, fc, 1961 to the present
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- 02 July 2015, pp 227-240
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3 - Fraction of stars with planetary systems, fp, pre-1961
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- 02 July 2015, pp 53-70
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