Stars
What is a star?
ball of gas
Stars last forever, true or false?
False
The Milky Way is what type of galaxy?
Spiral
The study of the origin, structure, and future of the universe is called?
cosmology
HR diagram shows the relationship between what two things
magnitude and temperature
To learn about stars astronomers study what?
star light
Hydrogen changes to helium in a process called?
nuclear fusion
Which is larger, a galaxy or globular cluster?
galaxy
The distance that light travels in one year
light year
spectrum
True or false: a star's inner layers are hot and thin
false.
How many phases are in a stars life cycle?
4
Name the three types of galaxies
spiral, elliptical, irregular
A rapidly spinning neutron star is a
pulsar
What instrument breaks a star's light into a spectrum?
spectrograph
List the stars in order from hottest to coldest
blue (main-sequence), white dwarfs, yellow (sun), Red (supergiants)
A star in it's second and longest stage of it's life is in what phase of the cycle.
Main-sequence star
How does studying distant galaxies help scientist learn about early galaxies?
Can learn that it takes a long time to flight to travel throughout space. Looking at distant galaxies we are able to learn how earlier galaxies looked.
A _________ is formed by a star that collapses under gravity to the point that its electrons and proton form neutrons?
neutron star
emission lines
Where on the modern HR diagram are the cool, brightest, red stars
top right
What three things are used to classify a star?
age, brightness, temperature
What do scientists think will happen to the universe?
Expand forever
The apparent shift of nearby stars relative to more distant stars as Earth orbits the sun is called
parallax
A spectrum of a star is call a ______spectrum
absorption