Question 14 of 21 Map Sapling Learnin macmillan learning A cloud of interstellar

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Question 14 of 21 Map Sapling Learnin macmillan learning A cloud of interstellar dust and gas that scatters light from a nearby star is called O a reflection nebula. O a planetary nebula. O an emission nebula. O a dark nebula. Trifid Nebula Light from an emission nebula often appears red or pink because The Trifid Nebula is a combination of a reflection nebula, an emission nebula, and a dark nebula. For O O O O more information about this image, o to Resources: Help WIth This ic. (Todd Boroson/ NOAO/ of interstellar extinction it has been Doppler shifted to longer wavelengths it has been Doppler shifted to shorter wavelengths it is mostly hydrogen which emits red light when excited. AURA NSF)

Explanation / Answer

1. Option ""1 reflection nebula"" is correct. The light scattering from stars nearby through interstellar cloud of gas and dust is not sufficient for gas ionization in nebula, although the energy is sufficient to produce dust visible by scattering.

2.option ““4 mostly hydrogen which emits red light when exited”” is correct. The Ionization degree and the composition of nebula are two vital factors which define nebula color. The low energy radiation presence and hydrogen gas existence in the interstellar,due to balmer series strong emanations nebula appears to be red.

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