Question

1. list the phases for an small/medium size star with an explanation of each phase

phase name:|description:

1. list the phases for a large or massive size star with an explanation of each phase:

phase name:|description:

1. list the phases both small/medium and massive stars have in common:

1. what are the 5 most common elements in the universe?

Explanation:

For a small/medium - size star:

• Protostar: A cloud of gas and dust starts to collapse under gravity.
• Main - sequence star: Hydrogen fuses into helium in the core, providing energy.
• Red giant: Hydrogen in the core is exhausted, outer layers expand and cool.
• Planetary nebula: Outer layers are ejected, forming a glowing cloud.
• White dwarf: The core remains, a small, dense, hot star that cools over time.

For a large or massive star:

• Protostar: Gas and dust collapse due to gravity.
• Main - sequence star: Hydrogen fusion in the core.
• Red supergiant: Core hydrogen is used up, star expands greatly.
• Supernova: Core collapses, causing a massive explosion.
• Neutron star or black hole: Remnant of the core, either a very dense neutron star or a black hole.

Common phases for both: Protostar and Main - sequence star. The 5 most common elements in the universe are hydrogen, helium, oxygen, carbon, and neon.

The 5 most common elements in the universe are hydrogen (most abundant, used in star fusion), helium (produced by hydrogen fusion in stars), oxygen (formed in massive stars), carbon (essential for life - as - we - know - it and formed in stars), and neon (produced in stellar nucleosynthesis).

Answer:

8.

Phase Name	Description
Main - sequence star	Hydrogen fuses into helium in core.
Red giant	Core hydrogen exhausted, outer layers expand and cool.
Planetary nebula	Outer layers are ejected, forming a glowing cloud.
White dwarf	Dense, hot core that cools over time.

9.

Phase Name	Description
Main - sequence star	Hydrogen fuses into helium in core.
Red supergiant	Core hydrogen used up, star expands greatly.
Supernova	Core collapses, causing a massive explosion.
Neutron star or black hole	Dense remnant of the core.

1. Protostar, Main - sequence star

1. Hydrogen, Helium, Oxygen, Carbon, Neon