Do you know which planets make up the terrestrial planets? Swipe through to find out 🌎 Terrestrial planets are categorised by their compact, rocky and metal-like surfaces. In the formation of our solar system, there were many more terrestrial planets, but they either merged with others or were destroyed, leaving just four in existence today. Discover more about the terrestrial planets in the BBC Series #ThePlanets on BBC Earth Lab via the link in our bio! . . . . #bbcearth #universe #space #constellations #cosmos #galaxy #stars #solarsystem #terrestrialplanets #planets #Earth #Mars #Mercury #Venus #bbcearthlab