A new hypothesis by Michael Efroimsky of the U.S. Naval Observatory suggests that these distinct features might be due to a large moon that once orbited the Red Planet. This lost moon, named Nerio, ...

The result of this is the perfectly spherical shape you’d expect in hydrostatic equilibrium is shifted to what we call an “oblate spheroid” — where the object is wider at its equator than ...

Every planet in our solar system is essentially round. But out in the universe, are there any planets that aren't spherical? Technically, planets are round, by definition; they need to have enough ...

A supernova remnant (SNR) discovered by astrophysicist Miroslav Filipović of Western Sydney University displays an astonishingly spherical shape. The SNR — officially named G305.4–2.2 and ...