Show:
Color and Temperature
Measuring Distance
Brightness
Surface Temperature
Hertzsprung-Russell Diagram
100
Stars absorb all of the ______ that hits them
What is radiation
100
Scientists measure a star's distance from Earth using ____ _____
What is light year
100
Some stars appear (dimmer/brighter) than others only because they are farther away
What is dimmer
100
Stars come in different colors because they emit ________ _________
What is thermal radiation
100
A Hertzsprung-Russell Diagram shows the relationship between the __________ and ___________ of stars.
What is luminosity and temperature
200
The energy of radiation given off by stars depends on their ___________
What is temperature
200
Light-years measure the distance that light takes to travel in ______ year(s)
What is one
200
A star’s brightness as it appears from Earth is called its
What is apparent brightness
200
a thermal radiation spectrum depends only on the ________ _______ of the object that emits it.
What is surface temperature
200
By studying H-R diagrams we learn about the ______, _____, and ______________ of stars.
What is sizes, colors, and temperatures
300
Very hot stars emit _____ light
What is blue
300
the slight shifting in the apparent position of a nearby star due to the orbital motion of Earth.
What is parallax
300
The ACTUAL brightness of a star is called its
What is luminosity
300
Astronomers classify stars according to ________ ________
What is surface temperature
300
About _____% of main-sequence stars fall along a band that runs from the upper-left corner to the lower right corner of the diagram.
What is 90%
400
Cooler stars emit _____ wavelength
What is red
400
Parallax is determined by _________
What is photography
400
The sun has a luminosity of ______
What is 5
400
The hottest (bluest) stars are called spectral type ___
What is O
400
The hottest main-sequence stars the ________ , and the coolest main-sequence stars are the _________.
What is brightest/dimmest
500
Very hot stars have a surface temperature above _______K
What is 30,000
500
The nearest stars have (small/large) parallax angles, while those of distant stars are too small to measure
What is large
500
Three factors control the apparent brightness of a star as seen from Earth:
What is hot big it is; how hot it is; how far away it is
500
What are all the spectral types?
What is OBAFGKM
500
The brightness of the main-sequence stars are related to their ______. The hottest blue stars are about 50 times more massive than the sun.
What is mass