Spectra for the Cygnus loop and the Orion nebula are shown above. Which of these is seen in the Orion nebula, but is not clearly visible in the Cygnus loop spectrum?
A)atomic hydrogen
B)atomic helium
C)ionized oxygen
D)ionized sulfur

Question

Quizplus · Accepted Answer

The Answer of Spectra for the Cygnus loop and the Orion nebula are shown above. Which of these is seen in the Orion nebula, but is not clearly visible in the Cygnus loop spectrum?
A)atomic hydrogen
B)atomic helium
C)ionized oxygen
D)ionized sulfur

Spectra for the Cygnus Loop and the Orion Nebula Are