Every now and then, we try to introduce some of the strange but interesting theories proposed by researchers around the world. Although many such hypotheses seem far-fetched and sometimes almost imaginary, they are always interesting to hear about, because I believe that unusual realities can sometimes emerge from original ideas and ways of thinking.
One example of such an unusual theory was presented by prominent physicist Anders Sandberg. According to the laws of physics, doughnut-shaped planets could exist, although the probability that such planets would actually form is extremely small.
In presenting and supporting the hypothesis, Sandberg describes some of the characteristics such planets could have: extremely short days, a dry outer equator, perpetual twilight in the polar regions, possible moons following highly asymmetric orbits, and gravity and seasons that vary considerably across the planet's surface.
The original article links to a fuller explanation, including the scientific argument for how such planets might arise. [source]