Mian Zhu

According to Einstein's theory, massive objects cause spacetime curvature, like a heavy ball warping a rubber sheet. As they accelerate, they create ripples — gravitational waves, akin to the circles from a stone dropped in a pond.

The standard cosmological model describes the birth of the universe as an explosion from a singularity — a point of infinite density and spacetime curvature.

A black hole, like a spinning wheel, twists a cloud of light particles, axions, around itself. These particles are the leading candidates for dark matter. The cloud follows the laws of quantum mechanics, resembling a giant atom: there are levels, and there are transitions between them.