Question

1. choose the best answer.

a ____ star has fused all its fuel and is similar in size to earth yet can be 200,000 times more massive.
○ red-giant
○ main-sequence
○ supergiant
○ white-dwarf

1. choose the best answer.

the milky way galaxy is an example of the most common type of galaxy, the ____ galaxy.
○ spiral
○ irregular
○ cluster
○ elliptical

Explanation:

Question 8

A white - dwarf star is formed when a star has exhausted its nuclear fuel. It is relatively small in size (similar to Earth in size) but has a very high density, which can make it 200,000 times more massive than what might be expected from its size. Red - giant stars are in an expanded state, supergiant stars are very large, and main - sequence stars are still fusing fuel. So the star that has fused all its fuel and is similar in size to Earth yet can be 200,000 times more massive is a white - dwarf.

The Milky Way galaxy is a spiral galaxy. Spiral galaxies are one of the most common types of galaxies, and they have a distinct spiral structure with arms. Elliptical galaxies have an elliptical shape, irregular galaxies have no distinct regular shape, and a cluster is a group of galaxies, not a type of galaxy.

Answer:

white - dwarf (the option corresponding to "white - dwarf" among the given options)

Question 9