MATERIAL FROM CLASS 9: Wednesday October 4
The Ring nebula: we point our telescope at the pointsA a hot white dwarf star in front of (most of) the gas of the nebula
B a star behind the gas of the nebula
C 'empty' space
D glowing gas in the nebula.
![[Image: ring nebula]](http://www.astro.wisc.edu/~sparke/ast103/ringnebula.jpg
)
Can you use Kirchhoff's laws to explain why we see spectra like this?
What element is most common in this gas?
![[Spectra: ring nebula]](http://www.astro.wisc.edu/~sparke/ast103/s04_recordedspectra.gif
)