AnyOldName3

Humans with two working eyes can tell the difference between a flat painted surface and a 3D world. Humans with only one eye might crash, though.

I personally don’t think they can be counted as skies and oceans etc. anymore when they’re being mixed in with multi-thousand-degree hydrogen/helium plasma. On a cosmological timescale, the Earth is converted to just more plasma in an instant. The reality on the ground of the body is that the ground’s gone and everything living there is gone and so’s the mantle under the ground. Things are defined partially by their interactions with their surroundings and the state they’re currently in, not how they used to be. Theia is not a planet, even if the theory where it once was turns out to be right. It stopped being a planet when it collided with the Earth, disintegrated, and re-accreted into parts of the Earth and the Moon.

I don’t think that can work. If you pick a random Earth-sized lump of the Sun as a potential planet, and swap its place with Earth, Earth would quickly get mixed in with the rest of the Sun and stop being a distinct entity, so be very silly to still call a planet, and without the Sun’s huge gravity to keep it held together, the lump of Sun would spread out into a gas cloud and then just become part of the interplanetary dust. Location makes some difference to whether or not something’s a planet.

What better time for prank signs than right after a real flood?

Printing off those signs and sticking them in the showers is a common student prank, so I wouldn’t assume they were real.