An astronaut on the International Space Station captured mysterious blue spheres in the sky last year. NASA’s Earth Observatory shared the photo last year, as well, shortly after it was taken.

And is a 31.5-inch difference in Earth’s tilt really that big of a ... their own shapes over time into something closer to spheres, a concept called hydrostatic equilibrium.

If you’ve ever heard the phrase “the music of the spheres,” your first thought ... the light from the central fire back to the Earth (and the inhabited part of the Earth always faced away ...