Presentation on theme: "The Hertzsprung – Russell Diagram"— Presentation transcript:
1 The Hertzsprung – Russell Diagram Astronomers use the H-R diagram to…* Show what stars are made of by looking at their color.*Compare the colors, brightness, temperature, and mass of stars.
2 The Hertzsprung – Russell Diagram *Look at the two stars, Sun and Zeta Eridani.Compare the two stars based on color, surface temp., and magnitude (brightness).Sun is yellow– Zeta Eridani is Blue. Color is due to a stars temperature.Sun temp. is much lower(6,000 K) – Zeta Eridani temp. is much higher(40,000 K)Sun is average magnitude – Zeta Eridani is very high magnitude.Sun and Zeta Eridani are Main Sequence stars. Incresed temp. = Increased Magnitude
3 Characteristics of a Galaxy A Galaxy is a large group of stars, gas, and dustheld tighter by gravity.
4 Types of Galaxies Spiral Galaxy *Have spiral areas that wind outward from inner regions.*The arms are made up of stars and dust.*Milky Way (our universe is a spiral).*Brightest stars.*Most common galaxy.
5 *Shaped like large three –dimensional ellipses. Types of GalaxiesElliptical Galaxy*Shaped like large three –dimensional ellipses.*Oldest stars.
6 *Smaller than other types of galaxies. Irregular Galaxy*Have many shapes*Smaller than other types of galaxies.*Newest stars.
7 Universe from Largest to Smallest GalaxySolar SystemPlanet