Finally, perhaps life will be accepted as a polysemous concept with each definitional cluster applying to a subset of the whole: biochemical life, evolutionary life, metabolic life, etc. Researchers may rely on context, accept some miscommunication, or simply stipulate the kind of life they mean. The example of planets, discussed in Brusse 2016 may help make this point. There was always a huge diversity within the category planet, which included the Sun and Moon until the Renaissance. In the early 1800s, asteroids were discovered. Initially, they were considered planets, they were demoted to ‘minor’ planets a few decades later, then simply ‘asteroids’ after the 1950s. Pluto was discovered in 1930, recognized as the smallest planet by the 1970s. From 1992 until 2006, many objects similar to Pluto were discovered until astronomers decided that the term planet actually covered at least two distinct, but scientifically interesting categories: typical planets and dwarf planets. Similarly, perhaps some of the categories described in section 1.2 will form the basis of accepted sub-categories of life.