Question

key ideas stars
use these prompts to take notes on each key idea in the key ideas presentation.
what is the life cycle of a star?
a star is...
a light - year is...
all stars have a life cycle in which they...
when a star like our sun nears the end of its life cycle, it becomes...
when a star more massive than our sun nears the end of its life cycle, it becomes...

Explanation:

• A star is a ball of hot gas.
• A light - year is the distance light travels in one year.
• All stars have a life cycle in which they are born, live, and die.
• When a star like our sun nears the end of its life cycle, it becomes a red giant and then a planetary nebula followed by a white dwarf.
• When a star more massive than our sun nears the end of its life cycle, it becomes a red supergiant, then undergoes a supernova explosion and can become a neutron star or a black hole.

Answer:

• A star: A ball of hot gas.
• A light - year: Distance light travels in one year.
• All stars' life cycle: Born, live, die.
• Sun - like star end: Red giant → Planetary nebula → White dwarf.
• More massive star end: Red supergiant → Supernova → Neutron star/Black hole.