# Mercury 4

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**Mercury 4** or variants may refer to:

- Mercury 4, a spacecraft of [Project Mercury](/source/Project_Mercury)
- [Mercury4](/source/Mercury4), an Australian boy band 2000–2004
- Mercury(IV), an unknown compound of the element [Mercury](/source/Mercury_(element))
- Mercury IV, a 1929 version of the [Bristol Mercury](/source/Bristol_Mercury) aircraft engine

## See also

- [Mercury (disambiguation)](/source/Mercury_(disambiguation))
- [Mercury-Redstone 4](/source/Mercury-Redstone_4), the second U.S. human spaceflight, 1961
- [Mercury-Atlas 4](/source/Mercury-Atlas_4), a 1961 unmanned space flight

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Adapted from the Wikipedia article [Mercury 4](https://en.wikipedia.org/wiki/Mercury_4) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Mercury_4?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.