Acutally, the red is not from H2 molecules, but rather HII (pronounced as "H two," thus the common confusion), or ionized ATOMIC hydrogen gas which is recombining.
As for the green emission nebulae, the green light comes from ionized oxygen. Same process, different wavelength.
Search found 4 matches
- Fri Jun 17, 2005 12:13 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: What makes nebulae red?
- Replies: 6
- Views: 9016
- Fri Jun 17, 2005 12:03 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Astronomer's Globe
- Replies: 4
- Views: 3527
- Fri Jun 17, 2005 12:02 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD of June 16, 2005, Vermeer's Astronomer and Geographer
- Replies: 14
- Views: 9593
wrong planet
and I do believe that the globe is of Saturn, not Jupiter.
- Thu Jun 16, 2005 11:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD of June 16, 2005, Vermeer's Astronomer and Geographer
- Replies: 14
- Views: 9593
another item
I'd like to know what the histogram-like feature is on the wall next to the HST portrait. Any guesses?