An Aurora, a Solar Eruption, and Mars in the Beehive

NASA's Astronomy Picture of the Day for October 14 shows Mars inside the Beehive cluster — M44, also called Praesepe — beneath a curtain of aurora, above a horizon near Lansjärv, Sweden. The caption calls it a cosmic coincidence, and the geometry is only half of it. The other half is what made the light in the first place, and it is not the Sun glowing at us directly. An eruption off the Sun reached Earth on October 10, 2026, causing strong disturbances in Earth's magnetic field. The colours are a conversion process: energetic particles from that eruption energize molecules in the atmosphere, and those molecules then release the extra energy as light. Nothing burns. The bright curtain is Earth's own air, briefly excited — with Mars parked inside the Beehive cluster in the same frame.