4.5 Billion Years Old Lyrics
| Song | 4.5 Billion Years Old |
| Artist | Alan Silvestri |
| Album | Cosmos: A SpaceTime Odyssey (Music from the Original TV Series) Vol. 4 |
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| Song | 4.5 Billion Years Old |
| Artist | Alan Silvestri |
| Album | Cosmos: A SpaceTime Odyssey (Music from the Original TV Series) Vol. 4 |