Words of This Topic
| Word | Meaning |
| Galaxy | A vast astronomical structure of crores of stars, planet systems, nebulae and dark matter bound by gravitation |
| Nebula | A huge cloud of gas and dust in space |
| Milky Way | The galaxy in which our solar system lies |
| Black hole | The extremely dense object at the centre of a galaxy |
| Big bang | The process from which galaxies came into being |
| Light year | The distance light travels in one year |
| Observable universe | The part of the universe we are able to observe |
| Observatory | A place fitted with instruments for observing space |
| Dark matter | Matter present in a galaxy that cannot be seen |
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