Young stars will have more of this element
What is Hydrogen?
Most stars are part of this group
What are Main Sequence stars?
The space dust and gas that is the birth place of stars
What is a nebula?
A huge collection of billions of stars held together by gravity
What is a galaxy?
The name for patterns of stars in the sky
What are constellations?
The electromagnetic radiation with the lowest frequency and energy
What are radio waves?
The 2 main things compared on this diagram
What are temperature and brightness?
The next phase the sun will enter after the main sequence
What is red giant?
Stars put out light energy because of this process
What is nuclear fusion?
The hottest stars are this color
What is blue-white?
Red giants are not part of the main sequence because they are very bright but also this
What is cool?
Astronomers use this unit to measure the distance between stars and galaxies
What is the light year?
Edwin Hubble's discovery
What is the red shift, or that galaxies are moving away from each other or that the farthest galaxies are moving the fastest
Luminosity and magnitude refer to this characteristic of a a star
What is brightness?
A Constellation DAILY DOUBLE!!!

All stars across the top of the diagram are this
What is bright?
The age of the universe
What is nearly 14 billion years?
The Range of radiation put out by a star is called this:
What is the electromagnetic spectrum?
This instrument shows the chemical composition and temperature of stars. It was also used to show that galaxies are traveling away from each other
What is a spectroscope?
The oldest stars on the diagram.
What are white dwarfs?
What feature of a new star determines how long a star will live and how it will end its "life"
What is its starting mass?