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What is the source of energy as a star evolves from an interstellar cloud to the protostar stage?
Gravity
How does Gravity play a role in the Death of a Star?
When a star runs out of energy, its mass is so great that the remaining energy cannot force the outer edges of a star away from its core, so the gravity causes the star to implode on itself.
How does the protostar stage of a star's life cycle compare with the main-sequence stage?
A protostar generates energy by friction whereas a main sequence star generates energy by fusion.
How is gravity involved in the formation of stars?
Gravity pulls the star in and tries to squeeze it down to a point. Because it pulls all of the atoms of the star in to the middle, gravity speeds them up, giving them energy. Eventually gravity gives enough energy to the atoms that they move fast enough that when they collide, they sometimes stick together and nuclear fusion happens. This is what gives a star its light and what keeps a star from collapsing further.
What is a star that has produce more energy than gravity can hold and explodes?
a supernova.
How do gravity and fusion have opposite effects on a star?
This fusion gives off energy, which expands the surface of the star. Gravity pulls the outer parts of a red giant towards the center.
Which stage of star has the most energy?
Obviously at the beginning, when it hasn't used up its fuel yet, and when it hasn't emitted this energy yet. Unless the star acquires some additional mass later in its life.
What process release the most energy from nuclear fusion burning or shrinking due to gravity?
In a star a balance exist between gravity shrinking and expansion due to fusion energy released.
How does the protostar stage of a stars life cycle compare with the main sequence stage?
A protostar generates energy by friction whereas a main sequence star generates energy by fusion.
Where does a star get enough energy to stop the collapse that would be caused by its own gravity?
radiation pressure
What prevent the enormous amount of energy released from the fusion reactions at star's core from blowing the star apart?
Gravity. However, sometimes the star IS blown apart.
What does the equilibrium between the outward pressures of radiation and the force gravity do?
"While the star can produce energy, that keeps the star in balance - it keeps the star from collapsing. By the way, another outward force is the gas pressure, but that, by itself, is not enough to counteract the force of gravity in the case of a star."
