   |
| Galaxies |
| all the stellar systems placed out of our Galaxy |
|
| Clusters of galaxies |
| like stars, galaxies tend to form groups and clusters from ten to thousands members |
|
| Superclusters of galaxies |
| groups of galaxies numbering up to one hundred thousand members |
|
| Radio sources |
| the celestial objects which are more brighter in the radio band than in the optical one |
|
| Relic radiation |
| slowly cooling down thermal radiation, keeps information about the earliest period of Universe evolution |