Buzz Aldrin had with him the Reserved Sacrament from his Presbyterian Church in Texas.
Read about it here. Thanks Bosco!
Creator of the universe, your dominion extends through the immensity of space: guide and guard those who seek to fathom its mysteries. Save us from arrogance lest we forget that our achievements are grounded in you, and, by the grace of your Holy Spirit, protect our travels beyond the reaches of earth, that we may glory ever more in the wonder of your creation: through Jesus Christ, your Word, by whom all things came to be, who with you and the Holy Spirit lives and reigns, one God, for ever and ever. Amen.