Stellar Evolution

noun The Milky Way is a barred spiral galaxy in the Local Group of galaxies.

• The Milky Way is a spiral galaxy that contains our solar system.
• I love stargazing and trying to spot the Milky Way in the night sky.
• The Milky Way is like a big cosmic highway with stars all around.
• Her eyes sparkled like distant stars in the Milky Way.

noun a person or thing from which a person, animal, or plant is descended or originates; an ancestor or parent.

adjective relating to a progenitor or progenitors; ancestral.

• The progenitor of this genetic disorder has been traced back to a single individual in the family tree.
• I heard that Sarah's great-grandmother is the progenitor of their family's wealth.
• My dad always jokes that he's the progenitor of our family's love for spicy food.
• The ancient civilization is considered the progenitor of modern society as we know it.