The planet associated with silver is the Moon.
While planets aren't literally made of silver, a traditional association links celestial bodies with specific metals. This comes from ancient astrology and alchemy. The Moon is traditionally associated with silver. Mercury is associated with quicksilver (mercury).
Here's a table summarizing the traditional associations:
| Planet | Metal |
|---|---|
| Moon | Silver |
| Mercury | Quicksilver (Mercury) |
This association is based on symbolism and historical beliefs rather than any actual planetary composition. The chemical composition of the Moon includes various elements, but it is not predominantly silver.
