Are we alone in the Universe?
The emergence of life

Previous “Drake Equation” – Next “Fermi Paradox
We are thinking creatures living on a planet orbiting a pretty common star in a pretty common galaxy. Our home planet has been around for about 4.5 billion years, while the Universe is about 13.7 billion years old. We just learned that there are about 1 000 000 000 000 000 000 000 = \(10^{21}\) planets potentially similar to the Earth in the cosmos, a number larger than the amount of