Lecture 02: Astronomical Numbers

What are the constellations? We will review the most basic feature of the night sky, the 6000 visible stars sprinkled about the sky, and introduce the idea of constellations, reviewing their history and uses by various cultures. Recorded 2007 Sep 21 in 1000 McPherson Lab on the C ...  Afficher plus

What is the shape and size of the Earth? This lecture traces historical ideas about the shape of the Earth, from ancient ideas of a Flat-Earth to Aristotle's compelling demonstrations in the 3rd century BC that the Earth was a sphere. We then discuss two famous classical measurem ...  Afficher plus

Before we can begin our exploration of astronomy, we need to develop a common language for notating large numbers, and introduce the basic units of length, mass, and time that we will use throughout the quarter. We will first re-introduce the basic metric system, explaining how t ...  Afficher plus

Why do stars shine? How long do they shine? This lecture describes the physics of stars on the main sequence, describes the mass-luminosity relation of main sequence stars, introduces nuclear fusion power and the nuclear fusion lifetimes of stars. From this we gain an important i ...  Afficher plus

How can we search for extraterrestrial intelligence, and what are we looking for? This second part of a 2-part lecture picks up where we left off yesterday by examining SETI, the Search for ExtraTerrestrial Intelligence, and reviews what we might look for and how. We will use thi ...  Afficher plus

Since astronomers can't actually travel to a star, they rely on two ingenious methods to measure a star's distance from earth. Listen in as Marshall Brain breaks down the science of space measurement in this editor's choice podcast from HowStuffWorks.