AST201H5 Chapter Notes - Chapter 1: Milky Way, Scientific Notation
Document Summary
Chapter 1 our place in the universe. How do we know we"re on earth, in our solar system: through observation of objects beyond earth; see objects in sky moving around us (ex. Sun: satellites show our planet, tldr; we know everything through observation and calculation. What is the solar system: consists of sun and all objects that belong to it (i. e. planets, moons, asteroids, comets, a large family. Where is the solar system: milky way galaxy (one of many galaxies within universe, milky way contains at least 100 billion stars, we know this through observing light and making calculations (don"t count the stars) Are all stars like the sun: no; different properties (sizes, temperature, how they live/die, know through observation of different stars. Galaxies: we know that there are other galaxies through calculations about distance (they are beyond our galaxy, all galaxies look different and are different sizes, our closest neighbour galaxy is andromeda (a. k. a.
