What are the units at the bottom of a HR diagram measured in?
What is Celsius degrees?
100
Who was Copernicus?
Who is the Polish astronomer that discovered the heliocentric theory?
100
What is an AU?
What is an astronomical unit?
100
Which is the brightest star on the HR Diagram?
What is Rigel?
200
What is the second stage of stellar evolution?
What is gravity compresses the Nebula to form a Protostar?
200
What happens as you move up on the Y axis of an HR Diagram?
The brightness or luminosity increases
200
What are the 3 types of galaxies?
What spiral, elliptical and irregular galaxies?
200
When do we use AU's and when do we use light years?
We use AU's to measure distances within our solar system, and LY's to measure distances outside our solar system
200
Which is the least bright star on the HR diagram?
What is Sirius B?
300
What is the 3rd stage of stellar evolution?
What is a main sequence star is formed from nuclear fusion?
300
What do we call the diagnal section that goes through an HR Diagram?
Main sequence stars
300
How are stars and planets different?
Planets reflect light, stars give off their own light
300
Which color of stars are in the middle of the HR diagram and represent stars that are moderately hot, relative to other stars?
What are yellow stars?
400
What path do stars take that have low mass?
What is they become white dwarfs and later black dwarfs with very high density?
400
What do we call the bottom group of stars under the diagnal section of an HR diagram?
What are white dwarf stars
400
What is parallax?
When objects closer to us appear to be shifting in greater amounts (example: moving thumb towards us and blinking eyes)
400
What is the doppler shift?
objects moving away from us have red shift and the distance between wave lengths is greater. Objects moving towards us have blue shift and shorter distances between wave lengths
400
What type of star is Aldebaran?
What is a Giant star?
500
What path do hi mass stars take?
They become super novas, and then either neutron stars or black holes?
500
Name all 4 groups of stars on an HR diagram
What are the super giants, main sequence, giant and white dwarf stars?
500
What is nuclear fusion? Explain.
When hydrogen is burned and becomes helium, main sequence stars do this which causes them to shine