H. Katsuragi

In a glass of murky liquid where starch is settling, the eye sees only a gray haze. Particles inside are moving, but what exactly is happening remains a mystery. Conventional optical instruments cannot penetrate such a suspension: light scatters already in the top layer.

On the surface of the Moon and asteroids, you can find pits smaller than a pinhead but with shiny, melted rims. Such marks are left by tiny meteorites, but the exact impact speed at which melting occurs remained unclear.