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Life Cycle of Stars (Grade 9)

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Life Cycle of Stars

As a low mass star begins ejecting material near the end of its life, it forms what?
  1. Planetary nebula
  2. Emission nebula
  3. Stellar nebula
  4. Bok globule
Which is NOT true about a protostar?
  1. It is usually much larger than it will be as a star.
  2. It glows due to the heat of the gases in its core.
  3. It may become a brown dwarf.
  4. It generates pressure by fusing hydrogen.
A red giant is formed when
  1. a star begins fusing helium.
  2. a star begins fusing hydrogen.
  3. binary stars merge.
  4. a star begins burning its hydrogen shell.
A low mass star will end its life as which of the following?
  1. Red Dwarf
  2. Red Giant
  3. Black Dwarf
  4. Brown Dwarf
When the helium and hydrogen shells around a low mass star's core begin burning, the star will become which of the following?
  1. Red Giant
  2. White Dwarf
  3. AGB Giant
  4. Black Hole
What will happen to a low mass star on the HR diagram after it begins ejecting its envelope near the end of its life?
  1. It will move upward, becoming more luminous.
  2. It will move to the right, becoming cooler.
  3. It will move immediately downward, becoming less luminous.
  4. It will move to the left, appearing hotter as the core is exposed.
Which of the following stars would be most likely to spend the longest time on the main sequence?
  1. a star with 0.05 solar masses
  2. a star with 1.2 solar masses
  3. a star with 7 solar masses
  4. a star with 15 solar masses
What will be the final state of the Sun?
  1. white dwarf
  2. black hole
  3. supernova
  4. black dwarf
In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a
  1. black dwarf.
  2. supergiant.
  3. white dwarf.
  4. black hole.
Which of the following stars is most likely to have a degenerate helium core at some point?
  1. A star that is a tenth the mass of our Sun.
  2. A star that is the same mass as our Sun.
  3. A star that is four times bigger than our Sun.
  4. A star that is ten times bigger than our Sun.

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