Doubly Ionized Oxygen

Oxygen atoms that have lost two electrons, often found in planetary nebulae and responsible for characteristic blue-green emission lines.

Source: apod.nasa.gov

APODs including "Doubly Ionized Oxygen"

Ou4: The Giant Squid Nebula

05/07/2025

NGC 6302: The Butterfly Nebula

06/06/2025

NGC 1360: The Robin's Egg Nebula

14/05/2025

The Mermaid Nebula Supernova Remnant

18/09/2024

Ou4: The Giant Squid Nebula

17/06/2024

NGC 1360: The Robin's Egg Nebula

05/08/2023

Ou4: The Giant Squid Nebula

12/10/2022

Supernova Remnant Simeis 147

13/01/2022

Simeis 147: Supernova Remnant

10/12/2020

Planetary Nebula Abell 78

16/10/2020

Ou4: A Giant Squid in a Flying Bat

07/10/2020

NGC 2359: Thor's Helmet

12/06/2020