Question

multiple-choice question what is the biggest thing thing we know? the milky way our solar system the universe the observable universe

Explanation:

To determine the biggest thing we know, we analyze the options: The Milky Way is a galaxy, our solar system is a small part of the Milky Way, the universe is vast but the observable universe is the portion we can detect and study, and it's the largest known structure we have evidence for.

Answer:

D. The observable universe