👉 The term "entoplastron" is used in astronomy and astrophysics to refer to a type of celestial body, which consists of two large bodies that orbit each other. The first body, known as the planet, has an orbital period that varies from about 160 days to approximately 240 days. The second body, known as the moon, is much smaller and orbits it every 27.3 days. Together, these two bodies form a system called
