How do we measure stellar luminosities?
Energy per second= watts
How do we measure stellar temperatures?
From color and spectral types
How do we measure stellar masses?
from period and average separation of binary orbit.
What is a Hertzsprung-Russel diagram?
A diagram that plots the luminosity and temperature of stars
What is the significance of the main sequence?
It fuses hydrogen into helium into the cores like the sun.
What are giants, supergiants, and white dwarfs?
The hottest stars.
What are the two types of star clusters?
Globular Clusters and Open Clusters
How do we measure the age of a star cluster?
By finding the main turn off of the H-R Diagram.
Do we know any cluster older than fourteen billion years?
No.
How old is the Universe?
13 billion years.
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