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the following answer originates from my knowledge or is an edit of an other users knowledge. i have underlined words were not hyperlinks and have been done so for the public's better understanding.

In our solar system Mercury is the smallest of the eight planets, and is the only one not to have an atmosphere. This may be due to:-

  • its small size ( Dwarf planets tend to be too small or they have a weak gravitational pull which cannot capture gasses to form an atmosphere. although dwarf planet Pluto is thought to have a very thin atmosphere.
  • its close proximity to the sun. there is a popular belief that solar storms or sun eruptions could have wiped off the atmosphere of Mercury or maby mercury had a very thin atmosphere which was drawntowards the sun due to its immense gravity
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13y ago

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