Assertion: elliptical galaxy | /r/MadeOf | older stars
Facets:
Source sentences:
text: Because elliptical galaxies contain older stars and less gas than spiral galaxies, it seems that the galaxy types represent part of a natural evolution: As spiral galaxies age, interact, and merge, they lose their familiar shapes and become elliptical galaxies.
text: Elliptical galaxies contain many older stars, but little dust and other interstellar matter.
text: Because elliptical galaxies contain older stars and less gas, scientists think that they are nearing the end of the evolutionary line for galaxies.