I've heard the theory that aliens avoid earth because they think we consume oxygen by choice which is poisonous to life so that we can generate biological fire. Seems improbable but it's fun to think we are excluded for appearing insane.
And wow! Hey! What’s this thing suddenly coming towards me very fast? Very very fast. So big and flat and round, it needs a big wide sounding name like … ow … ound … round … ground! That’s it! That’s a good name – ground!