Measured second-order temporal coherence of light used to illuminate the artificial “stars”. Laser light was scattered from suspensions of plastic microspheres undergoing thermal (Brownian) motion in water. The coherence falls to unity for delays longer than the characteristic coherence times. These are longer for larger particles (curves with longer dashes), which move more slowly, inducing less Doppler broadening. Analogous functions are seen for diluted milk (solid curve with all measured data points), where microscopic fat globules act as scatterers. These measurements of temporal coherence were made with a single telescope on a small and spatially coherent source.