A comet. It’s a smaller celestial body that’s composed of mainly ice and dust.
They respire and give off c0^2
The moment sun will die planet Earth will leave it's orbit exactly 8 minutes and 42 seconds later.
And then will go on wondering forever in the cold surrounding of universe till it's not captured into another stellar system which seems to be a little hard to imagine.
http://1kai.dokkyomed.ac.jp/mammal/en/genus_list.html
