Once again, the sun reminds us that we live inside a dynamic and indifferent cosmos — one capable of painting our skies without warning or apology. On the night of July 24, a stream of solar wind is pressing against Earth's magnetic field with enough force that the aurora borealis may descend into the northern United States, visible across as many as 18 states. It is a G1-level geomagnetic storm, modest by celestial standards, yet sufficient to stir something ancient in those who step outside and look north. The opportunity is real, the window is narrow, and by Saturday it will likely have pas