Week 6 DQ's

# Week 6 DQ's - defined a special unit of distance the parsec...

This preview shows page 1. Sign up to view the full content.

Discussion Questions(Due on Saturday): 1) How would you determine if a particular star was nearby (meaning being only a few parsecs away)? You can measure the parallax of a nearby star by photographing it from two points along Earth’s orbit. You might photograph it now and then again on six months from now. When you examine the photographs, you will discover that the nearby star is not in exactly the same place in the two photographs. This apparent shirt in the position of the star is called a parallax. Astronomers have
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: defined a special unit of distance, the parsec, to use in distance calculations. A parsec is defined as the distance to an imaginary star with parallax of one second of arc. One parsec turns out to equal 206,265 AU or 3.26 ly. This makes it easy to calculate the distance to a star given the parallax. D = 1/p 2) Select one type of Interstellar medium. Describe what it is, its temperature, and what part of the spectrum can it be observed. 3) Describe the different types of binary stars....
View Full Document

## This note was uploaded on 01/17/2010 for the course PHY 110 taught by Professor Smith during the Spring '09 term at Upper Iowa.

Ask a homework question - tutors are online