Catechism of the Catholic Church §659 — excerpt
"So then the Lord Jesus, after he had spoken to them, was taken up into heaven, and sat down at the right hand of God."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.