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- Besides being the closest and
- hottest planet in the solar-system,
- Mercury is one of the most
- dense, smallest and least known.
- Only a single spacecraft has
- visited Mercury, the Mariner 10,
- in 1974 when it flew within
- a mere 430 miles of the planet's
- night side.
-
- This image is a composite of
- 18 images each taken 42 seconds
- apart.