Galaxy Means Milky
A galaxy is a vast system of stars. The word comes from the Greek for milk, describing the band across our night sky.
A galaxy is a gravitationally bound system of stars, gas and dust. The word describes the appearance of ours from inside it: Greek *galaxias kyklos* means milky circle, from *gala*, milk. The Latin *via lactea* translates it directly, and so does the English Milky Way — three languages all reaching for the same image.
- A star system. *A spiral galaxy.*
- A brilliant gathering. *A galaxy of talent.*
- The Milky Way — our own galaxy. *Within the Milky Way.*
Word forms
| Form | Word | Example |
|---|---|---|
| Noun | galaxy | A distant galaxy. |
| Plural | galaxies | Billions of galaxies. |
| Adjective | galactic | Galactic centre. |
| Related | lactic | Lactic acid. |
| Related | lactose | Lactose intolerance. |
How it is used in a sentence
- The Milky Way is a barred spiral.Our galaxy's classification.
- Andromeda will collide with it.In about four billion years.
- Galactic and lactic share a root.Greek *gala*, milk.
Types of galaxy
- Spiral — with arms winding out from a bulge
- Barred spiral — with a central bar, like ours
- Elliptical — smooth and featureless, often very large
- Irregular — without regular structure
- Dwarf — small, and by far the most numerous
From Greek *galaxias*, milky, from *gala*, milk. The Latin *via lactea* and English Milky Way are translations of the same phrase.
Why is it called milky?
Because the band of our own galaxy seen edge-on from inside looks like a spill of milk across the night sky.
Are galaxy and lactose related?
Yes. Both build on words for milk, Greek *gala* and Latin *lac*, which share a common ancestor.