NATS 1740 Lecture Notes - Lecture 2: Hubble Space Telescope, Observable Universe, Astronomical Unit

• School: York University
• Department: Natural Science
• Course: NATS 1740
• Professor: Tatiana Paulin

Document Summary

Chapter 1 a modern view of the universe. Ancient belief in earth-centred (or geocentric) universe changed only when people were confronted by strong evidence. Galaxies that we see in the hubble space telescope photo are just one of several levels of structure in our universe. Earth is a planet in our solar system which consist of the sun, the planets and their moons and countless number of objects: solar system: stars and all the objects that orbit it. Our solar system belongs to the huge, disk-shaped collection of stars called the milky way galaxy: galaxy: is a great island of stars in space, containing between a few hundred million and trillion or more stars. Super clusters: regions in which galaxies and galaxy clusters are most tightly packed. Universe is the sum total of all matter and energy. One astronomical unit is earth"s average distance from the sun, which is about 150 million kilometers.