the hertzsprung – russell diagram astronomers use the h-r diagram to… * show what stars are made...
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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.
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
Characteristics of a Galaxy
A Galaxy is a large group of stars, gas, and
dust held tighter by
gravity.
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.
Types of Galaxies
Elliptical Galaxy*Shaped like large
three –dimensional ellipses.
*Oldest stars.
Types of Galaxies
Irregular Galaxy*Have many shapes*Smaller than other
types of galaxies.*Newest stars.
Universe from Largest to Smallest
Universe Galaxy Solar System Planet
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