ASTRONOMY ACTUAL EXAM QUESTIONS WITH CORRECT AND VERIFIED ANSWERS|LATEST
2025
Star-forming clouds appear dark in visible-light photos because the light of stars behind
them is absorbed by __________. -CORRECT ANSWER-interstellar dust
The basic requirement for a cloud to collapse to form a star is that __________. -CORRECT
ANSWER-gravity must be strong enough to overpower the cloud's internal pressure.
If a protostar has a mass too small for it to sustain nuclear fusion, it becomes the type of
object known as a -CORRECT ANSWER-Brown Dwarf
The collapse of a protostar with less than 0.08 timAs a protostar shrinks in size, its central
temperature rises along with its
es the mass of the Sun is halted by . -CORRECT ANSWER-degeneracy pressure
A star is born when it comes into ______, in which the energy released by fusion matches
the energy it radiates into space. -CORRECT ANSWER-Energy Balance
As a protostar shrinks in size, its central temperature rises along with its? -CORRECT
ANSWER-Thermal Pressure
A forming star spins more rapidly as it collapses because of conservation of? -CORRECT
ANSWER-Angular Momentum
A star that has not yet finished forming is called a? -CORRECT ANSWER-Protostar
, A gas cloud in which gravity is perfectly balanced against pressure is said to be in? -CORRECT
ANSWER-Gravitational Equilibrium
Which of the following represents key observational evidence that stars are born in clouds of
gas and dust? -CORRECT ANSWER-Young star clusters are always associated with clouds of
gas and dust.
Why does it make sense for star-forming clouds to be cold and dense? -CORRECT ANSWER-
these conditions help gravity overcome gas pressure.
Which of the following best explains the current state of agreement between theoretical
models of star formation and observations of star formation? -CORRECT ANSWER-Current
models can reproduce general features of star birth, but not all the details.
The main illustration in the video shows the life track of a one-solar mass star. Each point
along this track represents __________. -CORRECT ANSWER-the star's surface temperature
and luminosity at one time in its life.
Is a protostar in energy balance? Why or why not? -CORRECT ANSWER-No, because its core
generates less energy than its surface radiates into space.
What event brings the forming star into energy balance? -CORRECT ANSWER-the onset of
nuclear fusion in the core
The fundamental lesson that we learn from the life track is that the star's outward
appearance at any moment in its life reflects __________. -CORRECT ANSWER-the way it is
generating in its core
The star expels its outer layers into space almost immediately upon the end of Stage _____. -
CORRECT ANSWER-5
2025
Star-forming clouds appear dark in visible-light photos because the light of stars behind
them is absorbed by __________. -CORRECT ANSWER-interstellar dust
The basic requirement for a cloud to collapse to form a star is that __________. -CORRECT
ANSWER-gravity must be strong enough to overpower the cloud's internal pressure.
If a protostar has a mass too small for it to sustain nuclear fusion, it becomes the type of
object known as a -CORRECT ANSWER-Brown Dwarf
The collapse of a protostar with less than 0.08 timAs a protostar shrinks in size, its central
temperature rises along with its
es the mass of the Sun is halted by . -CORRECT ANSWER-degeneracy pressure
A star is born when it comes into ______, in which the energy released by fusion matches
the energy it radiates into space. -CORRECT ANSWER-Energy Balance
As a protostar shrinks in size, its central temperature rises along with its? -CORRECT
ANSWER-Thermal Pressure
A forming star spins more rapidly as it collapses because of conservation of? -CORRECT
ANSWER-Angular Momentum
A star that has not yet finished forming is called a? -CORRECT ANSWER-Protostar
, A gas cloud in which gravity is perfectly balanced against pressure is said to be in? -CORRECT
ANSWER-Gravitational Equilibrium
Which of the following represents key observational evidence that stars are born in clouds of
gas and dust? -CORRECT ANSWER-Young star clusters are always associated with clouds of
gas and dust.
Why does it make sense for star-forming clouds to be cold and dense? -CORRECT ANSWER-
these conditions help gravity overcome gas pressure.
Which of the following best explains the current state of agreement between theoretical
models of star formation and observations of star formation? -CORRECT ANSWER-Current
models can reproduce general features of star birth, but not all the details.
The main illustration in the video shows the life track of a one-solar mass star. Each point
along this track represents __________. -CORRECT ANSWER-the star's surface temperature
and luminosity at one time in its life.
Is a protostar in energy balance? Why or why not? -CORRECT ANSWER-No, because its core
generates less energy than its surface radiates into space.
What event brings the forming star into energy balance? -CORRECT ANSWER-the onset of
nuclear fusion in the core
The fundamental lesson that we learn from the life track is that the star's outward
appearance at any moment in its life reflects __________. -CORRECT ANSWER-the way it is
generating in its core
The star expels its outer layers into space almost immediately upon the end of Stage _____. -
CORRECT ANSWER-5
