Unit 1 – Spaceship Earth. Hypothesis vs. Theory. Theory vs. Hypothesis. Hypothesis. What is a hypothesis: Is a guess as to why something happens A creative idea as to how a scientific event or entity came to be, based on a number of logical assumptions.
1940s coined “Big Bang”
*Most astronomers accept that this is sufficient evidence to move big bang from the category of hypothesis to that of a theory!
Our study of Astronomy requires us to look UP and not DOWN. Humans today are not used to looking UP, we are not used to observing the sky – it appears to be of little use – and city living with its extensive light pollution often prevents us from seeing, and hence exploring, the “heavens”.
Most of us have some awareness that we are part of a system of planets encircling a star we call the Sun, and that we are part of a galaxy called the Milky Way, but beyond that our knowledge is often sketchy, cloudy, or even just plain wrong.
The next picture slide summarizes our location within the Universe, something that can be briefly summarized as: