Question

use the text to compare and contrast nebulae and galaxies.
nebulae and galaxies are two types of celestial objects. most are so far away that they can be seen only with a telescope, but astronomers can gather enough information to tell them apart. a nebula is a cloud of interstellar dust particles and ionized gases, while a galaxy is a large collection of stars held together by gravity. one of the main differences between the two is their size. a galaxy is generally much larger than a nebula. in fact, a galaxy can contain a nebula, but a nebula cant contain a galaxy. when a large amount of mass builds inside a nebula, the gravitational attraction increases, and the nebula collapses to form a star. however, while galaxies contain stars, a galaxy as a whole will not collapse to form a star. in addition, galaxies are found in clusters or groups in space, but nebulae havent yet been observed in these patterns.
are celestial objects
are collections of stars
collapse to form stars
have been found in clusters

Explanation:

The text clearly states that both nebulae and galaxies are celestial objects. A galaxy is a collection of stars, while a nebula is a cloud of interstellar dust and ionized gases. When a nebula has enough mass, it can collapse to form a star, but a galaxy as a whole does not collapse to form a star. Galaxies are found in clusters or groups, but nebulae are not observed in such patterns.

Answer:

• Are celestial objects: Nebulae (✓), Galaxies (✓)
• Are collections of stars: Nebulae (✗), Galaxies (✓)
• Collapse to form stars: Nebulae (✓), Galaxies (✗)
• Have been found in clusters: Nebulae (✗), Galaxies (✓)