The Bubble Nebula

NGC 7635 is a unique-looking emission nebula in the Cassiopeia constellation. It looks like a glowing bubble, and in some sense it is. It’s a shell of ionized H II gas blown out by a massive, hot young star SAO 20575. This central star has a visual magnitude of 8.7 and has a mass of 44 Suns. Its light travelled for 11,000 years before it hit my yard in Victoria, BC on June 7, 2024.