ASTR 114 1st Edition Lecture 1A Modern View of The UniverseWhat is our place in the universe?Star - A large glowing ball of gas that produces heat. EX: The sunPlanet - A large object that orbits a star. Usually rocky, icy, or gaseous in composition. Moon - Anobject that orbits a planet.Comet - A small icy object that orbits star. (Comets usually move really fast.) Solar (star) System - A star and all the material that orbits it.Universe - Everything within and between all of the galaxiesLight-YearA light year is a measure of distance used in reference to space. To measure the distance between any two places in space one uses light years.How to Calculate a Light-Year*We must first note that a light-year is the speed of light times one year.*These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.300,000km x 60 sec x 60 min x 24 hrs x 365 days = 9.46 x 10^12 km (9.46,000,000,000,000)sec 1 min 1hrs 1 day 1yrSimply put one light-year is 5,910,000,000,000