Star Test Review

The lifetime of a star depends on its:

• temperature

• absolute brightness

• apparent brightness

• mass

A star is born when:

• a nebula expands

• nuclear fusion starts

• helium and oxygen combine

• a protostar begins to school

The Hertzsprung-Russell diagram shows that main-sequence stars:

• increase in brightness as they increase in temperature

• are mostly hot and dim

• decrease in brightness as they increase in temperature

• are mostly cool and bright

The brightness of a star depends on its:

• distance and temperature

• color and temperature

• distance and color

• size and temperature

More than half of all stars are members of groups of two or more stars called:

• star clusters

• eclipsing binaries

• galaxies

• star systems

Characteristics used to classify stars include:

• size, distance, and brightness

• distance, size, and color

• size, brightness, and temperature

• color, brightness, and distance

What color are the coolest stars?

• red

• blue-white

• orange

• yellow

The force that tends to pull together the matter in stars is:

• dark energy

• gravity

• nuclear fusion

• dark matter

All stars begin as part of a large cloud of gas and dust called a(n):

• protostar

• nebula

• white dwarf

• super giant

Most stars are in the _________ _________ stage of their life.

• white dwarf

• giant

• main sequence

• super giant