What color will a star be with a surface temperature of5000–6000 K?

• blue

• white

• yellow

• red

The mass of a star can be determined by studying

• the wavelength of light emitted by the star.

• the color of the star.

• the distance between the star and Earth.

• binary star systems.

Which of the following is true about using parallax to measure distance to stars?

• The closer the star, the smaller is the parallax angle.

• The closer the star, the larger is the parallax angle.

• The larger the star, the smaller is the parallax angle.

• The larger the star, the larger is the parallax angle.

Approximately how long is a light-year?

• 9.5 billion km

• 95 billion km

• 9.5 trillion km

• 95 trillion km

Tags

NGSS.MS-ESS1-3

Which of the following is NOT a factor that affects the apparent brightness of a star as seen from Earth?

• how old the star is

• how big the star is

• how hot the star is

• how far away the star is

Star A is farther away from Earth than star B. Both stars have the same absolute magnitude. Which of the following is true about their apparent magnitude?

• Both stars will have the same apparent magnitude.

• Star A will have a greater apparent magnitude.

• Star B will have a greater apparent magnitude.

• The apparent magnitude of either star will not depend on its position.

A Hertzsprung-Russell diagram is used to show the relationship between

• absolute magnitude and apparent magnitude.

• temperature and absolute magnitude.

• parallax and temperature.

• apparent magnitude and parallax.

About 90 percent of the stars on the Hertzsprung-Russelldiagram are

• supergiants

• main-sequence stars.

• white dwarfs.

•             red giants.

Before a star is born, the matter that will become the star exists as a

• bright explosive supernova.

• red giant.

• black hole.

• cool, dark nebula.

A star is thought to be born when

• a protostar reaches a temperature high enough for nuclear fusion to begin.

• a red giant collapses on itself and becomes a black hole.

• pressure within a protostar becomes so great that a supernova occurs.

• increasing heat within a supergiant causes gravity to be greater than pressure.