What is the "Rare Earth Hypothesis"?

The inevitable question of "are we alone in the universe?" is destined to be raised now that the James Webb Telescope is operating and spitting out magnificent photos. 

 Science does not yet have a clear answer; experts disagree on whether Earth and its solar system are really unique in the expanse of space, or simply another ordinary rock in an average solar system.

Why Complex Life is Uncommon in the Universe" by palaeontologist Peter Ward and astronomer Donald Brownlee was originally published in 2000.

One of the theories put up by these researchers is the idea that sophisticated life on Earth could only have arisen because of a unique combination of cosmic events that occurred only a small number of times.

There's also Carl Sagan, the famous scientist who died in 1997. (the Neil deGrasse Tyson of his time). 

A "normal planet system" to Sagan, which included Earth, was merely another "rocky planet." He also believed in the existence of life on other planets.

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