Exam 10: The Interstellar Medium

X-rays come from certain regions of the interstellar medium because gas molecules in those regions are at a very high density.

______________ are cool, with temperatures of about 100 K and densities of ten to a few hundreds of atoms per cubic centimeter.

_______________ is believed to be produced by supernova explosions.

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

What observations demonstrate the existence of an interstellar medium?

Distinguish between pressure and density .   How are they related to each other?

The _______________ is a high temperature, low density region in the interstellar medium around the Sun.

H II emission nebula regions are found around _____________.

Coronal gas radiates energy at ______________ wavelengths.

If hydrogen (H₂) gas is the most common molecule found within the interstellar medium, then why do astronomers measure the amount of carbon monoxide (CO) gas to map molecular clouds?

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