Question

main sequence stars change quickly when they grow into a red giant. be sure to discuss the role of the force of gravity and/or fusion force in your explanation for why a main sequence star eventually grows in size to become a red giant. dont forget to include evidence to support your claim. depending on a stars initial mass, the last stage of a stars life cycle is either a white dwarf, neutron star, or black hole. these are some of the most dense objects in the universe. be sure to discuss the role of the force of gravity and/or fusion force in your explanation for why stars become much smaller and incredibly dense (compact) at the end of their life cycles.

Explanation:

Main - sequence stars convert hydrogen to helium in their cores via nuclear fusion. As hydrogen fuel runs low, the core contracts due to gravity. This heats up the outer layers, causing the star to expand and become a red - giant. Evidence includes the observed larger size and cooler surface temperature of red - giants compared to main - sequence stars of the same mass. For the end - stage of a star's life cycle, when nuclear fusion stops, gravity causes the star to collapse. In low - mass stars, electron degeneracy pressure stops the collapse, forming a white - dwarf. In high - mass stars, neutron degeneracy pressure may stop the collapse, forming a neutron - star, or if the mass is extremely high, a black - hole forms as gravity overcomes all known repulsive forces.

for main - sequence to red - giant: Main - sequence stars have hydrogen fusion in the core. When hydrogen is depleted, the core contracts due to gravity, heating the outer layers and causing expansion into a red - giant. Evidence: Red - giants are larger and cooler than main - sequence stars of the same mass.

for end - stage density: When fusion stops, gravity causes collapse. Electron or neutron degeneracy pressure resists collapse in white - dwarfs and neutron - stars respectively; in black - holes, gravity overcomes all resistance.

Answer:

for end - stage density: When fusion stops, gravity causes collapse. Electron or neutron degeneracy pressure resists collapse in white - dwarfs and neutron - stars respectively; in black - holes, gravity overcomes all resistance.