Term
|
Definition
| The tenuous gas, far less dense then air, comprising 99% of the matter in the interstellar medium |
|
|
Term
|
Definition
| Small particles or grains of matter, primarily carbon and silicates, distributed through interstellar space |
|
|
Term
| ___-wavelength radiation penetrates interstellar dust |
|
Definition
|
|
Term
|
Definition
| the dimming of visible and ultraviolet light by interstellar dust |
|
|
Term
|
Definition
| The effect by which stars and other objects, when viewed through interstellar dust, appear redder then they actually are. This is caused by the fact that blue light is more strongly absorbed and scattered than red light |
|
|
Term
|
Definition
| A low-density region of the interstellar medium that fills the space between interstellar clouds |
|
|
Term
|
Definition
| A region of interstellar gas that has been ionized by UV radiation from nearby hot massive stars |
|
|
Term
| Doppler velocities measured from __-cm radiation show that we live inside a rotating galaxy |
|
Definition
|
|
Term
|
Definition
| An interstellar cloud composed primarily of molecular gas and dust, having hundreds of thousands of solar masses |
|
|
Term
|
Definition
| A very fast-moving particle (usually an atomic nucleus); cosmic rays fill the disk of our galaxy. |
|
|
Term
| The milky way is mostly ___(light/dark) matter |
|
Definition
|
|
Term
|
Definition
| A spherically symmetric, highly condensed group of stars, containing tens of thousands to a million members |
|
|
Term
|
Definition
| A loosely bound group of a dozen to a thousand stars that formed together in the disk of a spiral galaxy |
|
|
Term
| Generations of stars must have formed even before ___ clusters did |
|
Definition
|
|
