Month: July 2025

BIOSIGNATURES – Signs of life in a planet’s atmosphere.

SETI (SEARCH FOR EXTRATERRESTRIAL INTELLIGENCE) – Scientific search for radio signals from intelligent life.

FERMI PARADOX – The contradiction between high probabilities of alien life and the lack of contact or evidence.

L (LIFETIME OF A COMMUNICATING CIVILIZATION) – The duration a civilization remains detectable.

fc (FRACTION OF CIVILIZATIONS THAT COMMUNICATE) – Probability that intelligent life can communicate across space.

fi (FRACTION OF PLANETS THAT DEVELOP INTELLIGENT LIFE) – Probability of life evolving intelligence.

fl (FRACTION OF PLANETS THAT DEVELOP LIFE) – Probability of life arising on suitable planets.

ne (NUMBER OF HABITABLE PLANETS PER STAR SYSTEM) – Average number of planets with potential for life.

fp (FRACTION OF STARS WITH PLANETS) – The proportion of stars that host planetary systems.

R (STAR FORMATION RATE) – The rate of star births in the Milky Way galaxy.