Planet Earth is Unique In A Universe full of Galaxies, Stars and Planets?

The only life in our Universe exists on planet Earth though the whole Cosmos has as much as 500 billion of galaxies, each with hundred billions of stars and millions of planets. The Solar Systems, hosting planet Earth, was created 4.5 billion years ago during the evolution of one of the oldest galaxies, the Milky Way with an age of 12-14 billion years. Earth is well located in the habitable zone of Sun that fuels its life, i.e. by being between the burning Venus and the freezing Mars. However, with the complex biogeochemical parameters, environmental and climatic conditions for life to exist, it is not strange that sustainable life on the Earth required very long time to develop. Liquid water, perfect solvent for the biochemistry of life, is also essential for sustainable life.

The life of stars, e.g. the Sun, how they are created, how long they live and how they eventually die is of interest to know. The Solar System itself is, still, part of a galaxy with own dynamics and interactions with the rest of the universe. A struggle controlled by shifting reactions, transformation and balance between gases, masses, dark matter and black holes in space full of radiations, gravity and nuclear forces.

Life somewhere, else, in this dangerous, complex and dynamic Universe is not likely to be find over-night though the very long age of the cosmos and the huge number of stars and planets.

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