0 of 22 Questions completed
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
You must first complete the following:
0 of 22 Questions answered correctly
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
|Table is loading
|No data available
Stars are formed when interstellar clouds of dust and gas collapse under the force of gravitational attraction.
Our Sun is a blue or white star.
The core of a red giant collapses outward under gravitational attraction.
When our Sun runs out of hydrogen, it will become a red giant.
High-mass stars use up their hydrogen more slowly than low-mass stars.
Nuclear fusion in high-mass stars can create elements heavier than iron.
A neutron star is less dense than a white dwarf.
We can directly observe black holes with telescopes.
Massive black holes have been identified at the center of spiral galaxies.
Molecular clouds must be both cold and dense to allow star formation.
Gravitational attraction in the protostar stage converts kinetic energy to potential energy.
Nuclear fusion begins in a star when the core reaches a specific temperature.
Stable stars are considered stable when inward gravitational force is balanced by outward radiation pressure.
High temperatures in a star’s core lead to outward radiation pressure.
Low-mass stars, up to 8 times the Sun\’s mass, eventually become white dwarfs.
Fusion reactions in a star progress from converting hydrogen to carbon.
Low-mass stars become red supergiants when their hydrogen is depleted.
Iron is the end point of fusion in stellar cores, as it requires more energy to fuse iron into heavier elements than it releases.
High-mass stars evolve into red supergiants immediately after the protostar stage.
If the remaining mass of a star’s core is between 1.4 to around 3 times the mass of the Sun, it becomes a neutron star.
Black holes are objects so dense that even light cannot escape their gravitational pull.
The Crab Nebula is an example of a planetary nebula.