PHYS 037 Lecture Notes - Lecture 1: Spacetime, Big Bang, Immanuel Kant
6 Dec 2016
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The universe began with the big bang (the big bang theory is the leading explanation of how the world began and how it came to be) 400,000 years after the big bang, the temperature of the universe cooled down and it allowed electron and ions to recombine. This allowed light to pass and the universe became transparent. The hydrogen electron formed 3 minutes after big bang. The first galaxies formed a billion years after the big bang. When looking back into the cosmos, the light that we see is from billions of years ago. When looking back at distant galaxies, we are looking back in time. Everything that we see with our bare eyes from earth is at least 10 minutes old. Plato: started to reason space and he saw it as an entity in which things come to be. Aristotle: saw space as an innermost motionless boundary that is relative to the motion.
