Floating in outer space is read as freedom from ordinary limits, and also as isolation far from everything familiar. Tradition sees it as the wish for perspective, or a feeling of being cut off.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.