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Astronomy > Chapter 11 > Flashcards

Chapter 11 Flashcards

1
Q

Interstellar medium

A

The matter between starsmade of gas and dust

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2
Q

Diameter of a dust particle “dust grain”

A

10^-7 m

Comparable in size to wavelength of visible light

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3
Q

Dusty regions of interstellar space are opaque to what wave lengths and transparent to which ?

A

Opaque to short wave lengths - UV and X-ray

Transparent to long wave lengths - radio and infrared

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4
Q

Far away stars appear more what color ?

A

Red

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5
Q

Reddening

A

Dimming of starlight by interstellar matter which scatters high frequency (blue) components of the radiation more efficiently than lower - frequency (red) components

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6
Q

The mass of a star may be determined

A

By studying its orbit around a binary companion

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Astronomy (28 decks)

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