Alison McAlpine’s visually ravishing documentary takes us to the Atacama Desert in Chile, where various scientists and oddball locals contemplate the immense, crystal-clear night sky. Although her film clocks in at a brisk 78 minutes, McAlpine attempts an admirable thoroughness: We see time-lapse images of the sky; we experience homemade special effects shots that depict astronomical phenomena; we hear researchers offer up scientific observations; we follow some of the impoverished residents of this remote region as they go about their days; and we even get occasional bursts of poetry, read by the director herself.