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Andromeda Galaxy size compared to the Milky Way
The size of the Andromeda Galaxy compared to that of the Milky Way. These two galaxies will merge in 4 billion years. It takes 3 billion years. During the merge, no star will collide with another because distances are immeasurable.
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 | Andromeda Galaxy | Milky Way |
|---|---|---|
| Type | Galaxy | Galaxy |
| Age | 10 billion years | 13.5 billion years |
| Diameter | 220,000 light years | 105,700 light years |
| Mean radius | 110,000 light years | 52,850 light years |
| Mass | 3.0 × 1042 kg | 1.6 × 1042 kg |
| Distance from the Milky Way center | 2.54 million light years | - |
| Number of stars | 1 trillion | 250 billion |
| Right ascension | 00h 42m 44.3s | 17h 45m 39.9s |
| Declination | +41° 16′ 9″ | −29° 00′ 28″ |
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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