Pretty much you have to say the name of an object which is slightly larger than the previous one. Try to be as specific as possible, and not just say something like 'building' or 'planet,' since both of these examples may be applied to a huge size range.
I'll start:
Quark
I'm taking the previous message as the singularity of a black hole: though I would say that it is definitely smaller than an atom core, and it might not exist at all. Anyways,
could [user avatar="https://cravatar.eu/helmavatar/TheElIenShow/74.png" name="TheElIenShow"]18194723[/user] be given a warning or something for going off topic and acting quite immature?
[user avatar="https://cravatar.eu/helmavatar/Tobberz/74.png" name="Tobberz"]9802996[/user]