An extrasolar moon, or exomoon, is a natural satellite that orbits an extrasolar planet or other extrasolar body. Although no extrasolar moons have yet been observed, it can be inferred from the empirical study of natural satellites in the Solar System that they are likely to be common elements of planetary systems. The majority of detected exoplanets are gas giants and in the Solar System, the gas giants have large collections of natural satellites (see Moons of Jupiter and Moons of Saturn). However, detecting them would be extremely difficult with current techniques.
Read more about Extrasolar Moon: Definition of Satellites Around Brown Dwarfs, Characteristics, Proposed Detection Methods, Nomenclature, Candidates, Detection Projects, Habitability
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“When we choose to be parents, we accept another human being as part of ourselves, and a large part of our emotional selves will stay with that person as long as we live. From that time on, there will be another person on this earth whose orbit around us will affect us as surely as the moon affects the tides, and affect us in some ways more deeply than anyone else can. Our children are extensions of ourselves in ways our parents are not, nor our brothers and sisters, nor our spouses.”
—Fred Rogers (20th century)