PHYS 182 Lecture Notes - Lecture 13: Breakthrough Listen, Datapoint, Yuri Milner
24 Jan 2018
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Based on star formation, fraction of stars with planetary systems, number of planets in capable of sustaining life, fraction life can from, fraction intelligent life can form, fraction they can communicate. R ic = rate at which civilization is produced. Fraction of stars with planetary system: at least 1 per star. Fraction of stars with planetary system can be 100% Planets can form in hostile environments - pulsars. Earth, venus, mars, moons titan and europa have qualifications to support life. We might be an anomaly so maybe like 10% all guesses here. Life appears to have developed almost immediately after formation < 1 billion. Only technologically advanced for about 50 years to let people know here here. Depends on your view of technology and what is civilization. Assuming all factors are 100% then 10 9 civilizations (1% of stars in galaxy) Look at to about 20 ly to see 100 stars, and see 1 with life.
