What percentage of stars in the galaxy are main sequence stars
90%
100
What spectral class has the greatest temperature?
Spectral class 0
100
What stage in a star's life is 100 times the size of our sun
supergiant
100
What is the difference between absolute magnitude and luminosity?
Absolute magnitude is how much light is given off by a star and luminosity is the brightness of a star compared to the sun
100
What stage of a star's life does nuclear fusion occur, and what is nuclear fusion?
protostar; the process by which hydrogen atoms combine to form helium
200
spinning versions of these stars are called _________.
pulsars
200
What factor plays a role in the next stage of a supernova?
the mass of a star
200
What two things is the H-R diagram used for?
to classify stars and show how they change over time.
200
What do the colors of the H-R diagram represent?
temperature and color of the star
200
After a supernova, does a star become a white dwarf or black dwarf?
Neither, it will become a neutron star or a black hole
300
What is the difference between a white dwarf and a black dwarf?
white dwarfs are less dense. white dwarfs have no fuel but glow faintly. black dwarfs are the remains of a white dwarfs after billions of years when it eventually stops glowing
300
Where are the dimmest star found on the H-R diagram?
bottom
300
What will happen at the end of a high mass star's life?
It will become a neutron star or a black hole
300
Where are the majority of stars found on the H-R diagram?
Main Sequence or S Curve
300
What is the difference in the life span of a high mass and low mass star
low mass stars live longer and high mass star have a shorter life span
400
How long is a light year?
the distance light travels in a year
400
What characteristics are used to classify stars?
size, brightness, and temperature
400
What determines whether a protostar becomes a star?
surface temperature
400
When is a star born?
When nuclear fusion begins
400
Depending on its mass, a star may live from ______ to _______ years.