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Astronomy Test #3

Terms in this set (38)

< 1.4
White dwarf
1.4 - 3
Neutron Star
> 3
Black hole
Types of galaxies
Spiral, barred spiral, elliptical, irregular
Two fundamental forces that can act at long distances
Electromagnetic and gravity
Two fundamental forces that only act at very short distances
Strong and weak
Georges Lemaitre
Discovered the big bang theory
Albert Einstein
Discovered the theory of relativity, which means the universe had a moment of creation.
What type of star did Edwin Hubble discover?
Variable Star
What was the significant property of Henrietta Leavitt discovered about these variable stars?
She was able to identify the change in brightness of the variable stars which then helped her distinguish how far away the star was
How did Hubble determine the distance to these stars?
...
After determining the distance, what else did Hubble measure to determine Hubble's law?
...
What quantity is measured along the vertical axis of the HR diagram?
Luminosity
What quantity is measured along the horizontal axis of the HR diagram?
Temperature
What is the term for a type of star near the upper left corner of the HR diagram?
Blue giant
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