Exam 10: The Interstellar Medium

The spacecraft ________ captured particles that scientists believe came from the ISM.

Which mission is mapping the heliosphere's boundary?

Which type of nebulae is produced when short-wavelength scatters from the dust and displays a blue hue?

Why is the sky blue during the day?

The type of radiation that is emitted when the electron in a hydrogen atom experiences a spin flip is a(n) _______________.

Molecular clouds are mapped using _____ gas instead of the most-abundant hydrogen because it radiates at radio wavelengths more efficiently.

The composition of the interstellar dust suggests that it is formed primarily in the atmospheres of cool stars.

The intercloud medium is believed to make up 90 percent of the mass of the interstellar medium.

H II Regions are also called emission nebulae.

Nebula is just another name for the interstellar medium (ISM).

What produces the coronal gas?

_______________ require that a young hot star (T ≥ 25,000 K) be relatively nearby.

To an observer on Earth, dust in the interstellar medium will cause a star to appear _______________ and_______________than it really is.

The ISM is easily visible to human eyes.

Which component of the interstellar medium has the greatest temperature?

What observations demonstrate the existence of an interstellar medium?