Lecture 2 The distance scale. Apparent magnitudes The magnitude system expresses fluxes in a given waveband X, on a relative, logarithmic scale: Note.
Galaxies. A galaxy is a large group of stars, dust, and gases. They come in variable sizes and shapes. The largest have over a trillion stars.
Galaxies are collections of stars (between 200 billion and 400 billion) that all rotate (orbit) around a massive central point.
Chapter 11c Surveying the Stars. 11.3 Star Clusters Our Goals for Learning What are the two types of star clusters? How do we measure the age of a star.
Chapter 21 Section 4 Star Systems And Galaxies. Done By Nick White And Gina Heath.
GALAXIES
