https://acubedsf.com/2026/04/19/sh2-206-or-ngc1491-the-fossil-footprint-nebula-or-alternately-the-signature-nebula/Space&Aliensen2026-04-19T16:08:25+00:00Sh2-206 or NGC1491: The Fossil Footprint Nebula (or, alternately, The Signature Nebula)space, astrophotography, Nebula, Sharpless, NGC, Sh2-206, NGC1491, Bow shock