[Seruzawa]

Dropping an asteroid would make the planet useless for a long while. It makes little sense if you want to take over a functioning world.

[cgbg]

If I remember “The Expanse” correctly they dropped an asteroid on Baltimore and it looked better afterwards.

;-)

[zeugma]

Dropping an asteroid would make the planet useless for a long while. It makes little sense if you want to take over a functioning world.

Depends entirely upon how large it is. There is a huge assortment of them out there.