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Why do smaller stars have a longer life span?
Because they have less fuel to burn.
What units do astronomers use to measure luminosity?
Name a star that is hotter and dimmer than the Sun. (Use the HR diagram)
What relationship exists between temperature and brightness for Main Sequence stars?
Brighter stars are hotter stars, dimmer stars are cooler stars
Is Rigel hotter or cooler than Denab? (Use the HR diagram)
Are red stars hotter or cooler than white stars? (Use the HR diagram)
Which group of stars can be characterized as cool and average in brightness?
Luminosity is another word for ______________________.
________________ can be described as a hot star with a high luminosity. (Use the HR diagram)
Compared with other stars on the HR diagram, our Sun is ___________ (Use the HR diagram)
average in temperature, average in brightness
Where would you place a star that is dim and hot on the HR diagram?
To the left of Sirius B
Which is larger - - universe or planet?
Which is larger - - universe or galaxy?
Which is larger - - solar system or galaxy?
Which is larger - - solar system or planet?
Which is larger - - planet or galaxy?
A light year is most appropriate for measuring distances
outside of our solar system
Which theory states that the universe was formed from a violent explosion?
the big bang theory
A star explodes into a supernova and then collapses into a black hole. What do we know about this star?
It was a very large star.
Our sun is the star that is ______________ to us.
Studying light waves show us that the galaxies are moving away from each other. This is evidence that ________.
the universe is expanding
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