fish4096 t1_jbdutkc wrote
Reply to comment by dave_hitz in TIL the largest moon in our solar system, Ganymede, is larger than the planet of Mercury by Jugales
gotta have clear definition of "big" then.
By diameter? Mass? Bigger then what?We could of course take Earth as ballpark and drive rules from there, but this wont get us far the more of universe we discover. There will be all kinds of odd objects that dont fit into our little bubble of categories.
The reason I'm upset about Pluto is because it's one of those "classic" discoveries, something that should be honored.
dave_hitz t1_jbfgcfu wrote
Big enough for gravity to squeeze it to round. Most asteroids are odd shaped rocks. They don't count. Get enough rocks to generate enough gravity to pull the rocks into a sphere, then you've got a planet.
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