502
NASA Pride Rule
(infosec.pub)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
I guess you could say since earth is part of the solar system, the earth phenomena are space related (it's all about diversity anyway, why not include algae?). Plus what amateur astrophysicist hasn't had to deal with a cloudy night ruining a night if star gazing?
Space is 100 km away from Earth so not even the sprites are included (the aurora is). Don't confuse space Γ universe. But yes, our planet is definitely the most interesting one.