Read the story summary. While visiting a meteor crater, a teenager comes across a meteorite that inspires him to become an astronaut.

What kind of nonfiction source did the author most likely use to help make the elements in the story realistic?
(A an animated film about a group’s voyage through the galaxy
(B a blog where people speculate about the existence of aliens
(C popular television series set in the far reaches of space
(D government website on space exploration