The Bubble Nebula (NGC 7635)

The Bubble Nebula (NGC 7635)

The Bubble Nebula, catalogued as NGC 7635, is a striking emission nebula located about 7,100 light-years away in the constellation Cassiopeia. It gets its name from the nearly perfect, spherical “bubble” of gas that appears to float inside a glowing cloud of hydrogen.

This cosmic bubble is about 7 light-years across and was created by the fierce stellar wind from a massive, hot O-type star at its center. The star, many times more massive and luminous than our Sun, blasts out radiation and particles that push surrounding gas into a shell, forming the bubble.

The Bubble Nebula lies in a larger molecular cloud, and its glowing appearance comes from ionized hydrogen gas that emits light in the red part of the spectrum. For astrophotographers, it’s an excellent narrowband target — especially with Hα and O III filters — showing delicate structures, shock fronts, and surrounding star fields.

✅ Key facts for readers:

• Type: Emission nebula (H II region)

• Distance: ~7,100 light-years

• Diameter: ~7 light-years

• Location: Constellation Cassiopeia

• Power source: Stellar wind from a massive O-type star

Taken with

1. Skywatcher Explorer 200/1000
2. Touptek 183 CA
3. On Skywatcher EQ 5 Pro Mount
4. Guide scope TS Optics 50/90 
5. Guide Camera Touptek 327C
6. Sequencer NINA Advanced Sequencer.
7. Guiding with PHD2
8. Exposures 20 x 600 secs
9. Stacking 13 Frames in ASTAP
10. Streach and Beackground removeal with Siril & GraXpert
11. Final Touch GIMP