Download Characteristics of Stars

Astronomers classify stars according to their physical characteristics.
These include the following properties:
Chemical Composition
•Scientists study the star’s _______ _______ __________ to determine
what it is made of. Stars vary in their composition, but most are made of
_____________, _____________, and a small percentage of
_____________ ______________.
Brightness
•Brightness depends upon its _______and _______________.
•____________ brightness is its brightness as seen from Earth.
•____________ brightness in the brightness it would have if seen
from a _______________ distance from Earth.
Size
•Very large stars are called _________ or ________________ stars.
•Our sun is a ______________-sized star.
•Most stars are __________________ than the sun.
•White dwarfs are about the size of ________________.
•______________ stars are about 20 km in diameter.
Color and Temperature
•A star’s __________, color, and temperature are all closely related.
•___________ and _____________ stars have the ______ ________
and burn at the ___________temperatures.
•Yellow, Orange, and Red stars have ______ _______ and burn at
_____ temperatures.
•Our sun is a ____ _______ star and burns with a ______________ color.
•Scientists study the star’s _______________ to find its temperature.
•Our sun has a surface temperature of about _____________.
KEY
Chemical Composition
•Scientists study the star’s ____spectrum__________ to determine
what it is made of. Stars vary in their composition, but most are made
of _hydgrogen____, __helium___________, and a small percentage of
___other__________ __gasses____________.
Brightness
•Brightness depends upon its _size_and __temperature_______.
•__Apparent___ brightness is its brightness as seen from Earth.
•_Absolute____ brightness in the brightness it would have if seen
from a ____standard___________ distance from Earth.
Size
•Very large stars are called __giant___ or ___supergiant_____ stars.
•Our sun is a __medium____________-sized star.
•Most stars are ___smaller_______________ than the sun.
•White dwarfs are about the size of __Earth______________.
•__Neutron____________ stars are about 20 km in diameter.
Color and Temperature
•A star’s __________, color, and temperature are all closely related.
•_Blue_____ and __White____ stars have the most mass
and burn at the highest temperatures.
•Yellow, Orange, and Red stars have low _mass___ and burn at
low ___temperatures__.
•Our sun is a _low _mass_ star and burns with a __yellow___ color.
•Scientists study the star’s _spectrum____ to find its temperature.
•Our sun has a surface temperature of __5500C___________.