world, whirled

World or world means the Earth, the planet, or the universe--
It seemed like everyone in the world was there.
The world is round, or nearly round.

World may also be used figuratively, to mean someone's life or experience--
"My whole world ended the moment you left me..."
"Don't they know, it's the end of the world, it ended when you said good-bye."

Whirled or whirled ( rhymes with world ) is the past tense ( yesterday, or some time ago ) of "whirl", meaning spin or turn about in a circle, quickly--
The ride whirled about so fast that everyone became dizzy.
He whirled a pennant about over his head, and cheered for the home team.

Now that you know that, you can say--
"He didn't believe it when the science teacher told him that the world whirled about in space."