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Because of the obscuration of visible light by

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8.Because of the obscuration of visible light by interstellar dust, we can observe stars only within a
9.Dark dust clouds radiate mainly in the in the ultraviolet part of the electromagnetic spectrum.
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11.Water, formaldehyde, carbon monoxide, and numerous organic molecules have been detected in
12.The chemical composition of an interstellar medium is basically similar to that ofthe Sun.13.The density of atoms in interstellar medium is most similar to theinterior of a TV tube.14.Of the following objects, the one that shines the most like an emission nebula shines isaglowing florescent tube.15.Stars interact with emission nebulae byexciting their atoms enough to create light.16.A dark interstellar globule is about the same size as theOort cloud.17.The Rho Ophiuchi cloud, shown in Figure 18.14 (“Dark Dust Cloud”), is dark becausestarlightfrom behind the cloud does not penetrate the cloud.18.If a proton and an electron within a hydrogen atom initially have parallel spins, the atom mustemit energy.19.Of the following telescopes, the one best suited to observe dark dust clouds is aradio telescope.20.Of the following, the largest interstellar cloudsmolecular clouds.21.Molecular clouds are routinely studied using spectral lines from all but which of the following?
Astronomy Chapter 19 Review1.Given the typical temperatures found in interstellar space, a cloud containing a few million
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4.An evolutionary track charts a star or protostar’s changing position within its parent cluster.
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6.Brown dwarfs take a long time to form, but will eventually become visible as stars on the lower.
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8.Shock waves produced by emission nebulae can initiate star formation in nearby molecular.
9.The formation of the fist high-mass stars in a collapsing cloud tends to inhibit star formation.

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