ASTR Ch.15 Test Bank

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the avg. density of the interstellar medium is

much less dense than the best vacuum on earth

The dust in the interstellar medium comes primarily from

stellar winds of main-sequence stars

the lowest density gas in the interstellar medium is also the

cold cores of molecular clouds

the interstellar medium is divided up into three kinds of gas clouds. These are

cold (100K), warm (8000K), hot (1 million K)

we observe neutral hydrogen gas by using

Molecular hydrogen atoms are found

only inside dense clouds where they are shielded from stellar radiation.

the coldest molecular clouds in our galaxy have temperatures of approximately

Electronic transitions from the H2 are easily seen at

if you could watch stars forming out of a gas cloud, which stars would form first?

high-mass stars

when looking at the space between stars, what might you see?

the avg. density of the interstellar medium is

if you wanted to observe heavy atoms in the interstellar medium, where would be the best place to look?

when radiation from an object passes through an interstellar medium,

the object appears redder and dimmer

Dust in the ISM appears dark in___ wavelengths and ___ in bright wavelengths

visible, infrared

Dust reddens starlight because it

it preferentially affects light at optical and shorter wavelengths

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