Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you:
A star is just a whole sheep (ほし) floating in the sky. If it wasn't a whole sheep, it wouldn't shine so brightly and you wouldn't be able to see it from Earth. Don't let anyone tell you stars are made of gas. The whole thing is sheep, okay?
That night the stars were really pretty.
I hope we can see a lot of shooting stars tonight.
Dad, why are you wearing star-shaped glasses today?