Stars and Their Life Cycles
Physics ⇒ Earth and Space Physics
Stars and Their Life Cycles starts at 8 and continues till grade 12.
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See sample questions for grade 11
Context: A star is observed to be in the red supergiant phase. What is the next likely major event in its life cycle?
Describe the process that leads to the formation of a protostar.
Describe the role of gravity in both the formation and death of stars.
Describe what happens during a supernova explosion.
Explain the difference between a red giant and a white dwarf.
Context: A star is observed to be in the red supergiant phase. What is the next likely major event in its life cycle?
Context: A star is observed to have a surface temperature of 3,000 K and a luminosity 1,000 times that of the Sun. Based on its position on the Hertzsprung-Russell diagram, what is the most likely evolutionary stage of this star?
Context: A star with an initial mass of 15 solar masses ends its life in a supernova explosion. After the explosion, the remnant core has a mass of 2.5 solar masses. What is the most likely final state of this remnant?
(1) White dwarf
(2) Neutron star
(3) Black hole
(4) Brown dwarf
A star is observed to have a mass of 20 times that of the Sun. What is the most likely remnant after its death?
(1) White dwarf
(2) Neutron star
(3) Black hole
(4) Brown dwarf
A supernova is most likely to occur at the end of the life cycle of which type of star?
(1) Low-mass star
(2) Medium-mass star
(3) High-mass star
(4) Brown dwarf
During which stage does a star fuse helium into heavier elements?
(1) Main sequence
(2) Red giant or supergiant
(3) White dwarf
(4) Protostar
Which of the following best describes a planetary nebula?
(1) A region where new stars are forming
(2) The outer layers of a red giant star ejected into space
(3) The remnant of a supernova explosion
(4) A cloud of gas orbiting a planet
A star spends most of its life in the __________ phase.
A star with a mass less than about 8 times the mass of the Sun will end its life as a __________.
A star's color is primarily determined by its __________.
Fill in the blank: A neutron star is formed when the core of a massive star collapses and protons and electrons combine to form __________.
True or False: All elements heavier than iron are formed during supernova explosions.
True or False: All stars eventually become black holes at the end of their life cycles.
True or False: Brown dwarfs are considered failed stars because they do not sustain hydrogen fusion in their cores.
True or False: The heavier the initial mass of a star, the more likely it is to end its life as a black hole.
