– Anthropic Principle
– SETI Institute
– Drake Equation
– Copernican Principle
– Mediocrity Principle
– Uniformity Principle
– Kardashev Scale
Category 1: Alien Civilizations are Rare.
1A: The Rare Earth Hypothesis (planets birthing and supporting life is astronomically rare).
1B: Great Filters (a hurdle/barrier inhibiting the potential for intelligent life).
1C: Civilizations are short-lived (time discrepancy : section 2B)
Category 2: Alien Civilizations are Difficult To Detect.
2A: They communicate but we are not capable of receiving (technological discrepancies, physical/fundamental discrepancies).
2B: Time discrepancy.
3B: They have no interest in communicating.
4B: They intentionally keep quite.
Category 3: Alien Civilizations are Difficult to Recognize
3A: Aliens are here secretly
3B: Aliens have visited our ancestors
3C: Alien life is not recognizable
*this episode covers the topics highlighted in red
– Formation of Heavier Elements
– Stable Galactic Orbit
– Stable Host Star
– Stable Habitable Zone
– Eccentric Planetary Orbit
– Giant Planets
– Large Moons
– Planetary Rotation Rate
– Plate Tectonics
– Magnetic Field
– Oxygen Level