Very low estimates would contribute to the Rare Earth hypothesis, which posits that a series of extremely unlikely events and conditions led to the rise of life on Earth.
Rare Earth hypothesis, the theory that complex life in the universe is exceptionally rare
Earth | Earth-616 | Google Earth | Earth Day | Friends of the Earth | From the Earth to the Moon | Cursed Earth | Earth, Wind & Fire | Middle-earth | From the Earth to the Moon (miniseries) | Manfred Mann's Earth Band | The Day the Earth Stood Still | Earth: Final Conflict | Iced Earth | Down to Earth | Rohan (Middle-earth) | Riemann hypothesis | Journey to the Center of the Earth | Elf (Middle-earth) | Earth Summit | Earth's magnetic field | Earth Liberation Front | Earth Crisis | The Day the Earth Stood Still (1951 film) | Rare Ltd. | I Mother Earth | Flat Earth | Earth-Three | Earth Island Institute | Declared Rare and Priority Flora List |