They're definitely planets. Would we have an entire continent named after one, and would Bungie name a guardian class after the other if they weren't planets?
English
-
exactly
-
They're not planets.. Or they would be shown on the graphs kids are shown to show them the planets in the solar system. Like Pluto was and is now again... And how it wasn't shown when it wasn't classed as a planet. They're moons (or stars).
-
They are planets because they orbit the sun. Europa orbits a brown dwarf star