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Milky Way vs Andromeda Galaxy size comparison
Size comparison between our galaxy, the Milky Way and the Andromeda galaxy. Andromeda is the result of the fusion of two galaxies. In 4 billion years Andromeda will merge with the Milky Way to form a new galaxy.
Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.
| Object | Milky Way | Andromeda Galaxy |
|---|---|---|
| Type | Galaxy | Galaxy |
| Age | 13.5 billion years | 10 billion years |
| Diameter | 105,700 light years | 220,000 light years |
| Mean radius | 52,850 light years | 110,000 light years |
| Mass | 1.6 × 1042 kg | 3.0 × 1042 kg |
| Distance from the Milky Way center | - | 2.54 million |
| Number of stars | 250 billion | 1 trillion |
| Right ascension | 17h 45m 39.9s | 00h 42m 44.3s |
| Declination | −29° 00′ 28″ | +41° 16′ 9″ |
Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.
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