Details Title: Astronomy Book Vocabulary Description: Chapter 4/Section 2 Total Flash Cards: 8 Created: 12/04/2008 04:03:21		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Astronomy Flashcards
Cards in this set: Term constellation Definition an imaginary pattern of stars in the night sky Term spectrograph Definition an instrument that separates light into colors and makes an image of the resulting spectrum Term main sequence  Definition a diagonal area on an H-R diagram that includes more than 90% of all stars Term Hertzsprung-Russell diagram Definition a graph relating the surface temperatures and absolute brightness of stars Term apparent brightness Definition the brightness of a star as seen from Earth Term absolute brightness Definition the brightness a star would have if it were at a standard distance from Earth Term parallax Definition the apparent change in position of an object when seen from different places Term light-year Definition the distance that light travels in one year