Earth might once have resembled a hot, steamy doughnut
The newly proposed planetary shape is called a synestia
![synestia illustration](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/07/060617_AY_synestia_main.jpg?fit=860%2C460&ssl=1)
PUFFED UP Early in its development, a rocky planet may turn into a synestia (illustrated), a spinning disk of vaporized rock that looks like a jelly-filled doughnut with a small, solid core (gray).
S. Lock/Harvard Univ.