From David Bercovici’s lecture, it is clear that Earth is not an ordinary planet. It is the only planet that mankind knows of that can support intelligent life. Earth is the only terrestrial planet with water and a habitable climate. The chance of having life itself in a planet is extremely low numerous dynamic variables play into when looking at life on other planets. The specific conditions that are required for a planet to support life and to become habitable are impressive, and it allows people to understand how slim the probability was for origins of mankind to have started on Earth.
Bercovici first explains how our universe started from the Big Bang and how our solar system was created. The planetary clouds collapsed and formed stars. Our star, the sun, is also unique in a sense that since it is a small star. All stars use hydrogen fusion to use energy, and since our sun is a small star, it burns longer than other giant stars. These giant stars undergo hydrogen fusion but when it runs out of elements to burn through it goes into Supernova. This explosion of the star leaves all the elements that makeup in the world. Elements like carbon, oxygen, nitrogen, phosphate, magnesium, iron, silicon, etc.… all these elements are building blocks of life and helped create Earth.
Earth, when compared to other terrestrial planets in our solar system, like Venus and Mars is the only planet that has habitable climate and water. These two features are essential for life, and so far we have not found any planets with a habitable climate, but some planets and moons that have had water in the past solid and liquid. Earth is also unique because it has plate tectonics which other planets do not have. Earth uses plate tectonics to regulate its climate. The two planets most like Earth is Venus and Mars, Venus is too hot for life to exist and Mars is too cold for life to exist. Earth has just the right temperature for life to exist.
If we want to look at life and where it came from and how other planets can support life, we should look no other planet than Earth, and for the time being, Earth is the only planet that we know of that can support life. However, the probability of having all the right conditions for a habitable planet to exist is so low it makes us wonder if our origin was just dumb luck or are their other planets out in the universe with the same or similar conditions that have intelligent life.
The unlikeliness of mankind to exist should give a different perspective of origins of our universe. Beating the odds to have existed as a human on Earth should be looked as being very fortunate. Origins of Earth helps us understand how we came to be as mankind and should be viewed as a flexible guiding blueprint in search of other life in other habitable planets and how other origins are formed to be in the future.