8.9A IPC

Which of the following correctly describes the main sequence stage of a star's life cycle?

• The star is collapsing due to gravity

• The star is fusing hydrogen into helium in its core

• The star is expanding into a red giant

• The star is cooling down as a white dwarf

Tags

NGSS.HS-ESS1-1

On the Hertzsprung-Russell diagram, the hottest and brightest stars are typically located in the (a)   .

• Upper right corner
• Lower left corner
• Upper left corner
• Lower right corner

The characteristic of a star that determines its position on the main sequence of the Hertzsprung-Russell diagram is (a)  

• Age
• Color
• Distance from Earth
• Mass

A star is observed to have a surface temperature of 3,500 K and a luminosity 10^6 times that of the Sun. Based on the Hertzsprung-Russell diagram, this star is most likely to be a (a)  

• Red Supergiant
• White dwarf
• Red giant
• Blue supergiant

You discover a new star and plot its position on the Hertzsprung-Russell diagram. It appears above and to the right of the main sequence. Considering its position and the stages of stellar evolution, formulate a hypothesis about this star's current state and its future development. Which of the following is the most plausible explanation?

• It's a neutron star resulting from a recent supernova explosion

• It's a red giant that may eventually shed its outer layers and become a planetary nebula

• It's a white dwarf that has completed its life cycle and will slowly cool

• It's a main sequence star that will remain stable for billions of years

Our sun is in this stage of its life

• nebula

• red giant

• black hole

• main sequence star

What is the final stage in the life cycle of a star like the Sun before it becomes a white dwarf?

• It becomes a black hole

• It turns into a red giant

• It explodes in a supernova

• A planetary nebula is formed

What causes a star to enter into the red giant stage of a star.

• The star explodes.

• The star runs out of Helium.

• The star runs out of Hydrogen.

• Gravity pulls it apart.

Tags

NGSS.HS-ESS1-1

Match the following stellar phenomena with their descriptions.

• A small, dense star that is the remnant of a red giant's core.

• a red super giant

• A cloud of dust and gas where Stars form

• a white dwarf

• An object with gravity so strong that not even light can escape.

• a planetary nebula

• A large, bright star with a cool surface, often the next stage after a main-sequence star.

• a black hole

An astronomer observes two stars with the same surface temperature but different luminosities on the Hertzsprung-Russell diagram. Star A is more luminous than Star B. What can be inferred about the relative sizes of these stars?

• Star A is smaller than Star B

• Star A is the same size as Star B

• Star A is larger than Star B

• The size cannot be determined from this information alone