it's small size and low gravity
because the gravity keeps the giants planets' gases from escaping.
because the gravity keeps the giants planets' gases from escaping.
For the same reason that our atmosphere on Earth does not escape into space - gravity.
Mercury's gases escaped into space once
The escape velocity of Mercury is about 4.3 km/s, which is the speed an object must reach to break free from Mercury's gravitational pull and move into space.
It feels bad about how ugly it looks stupid. DAH
The solar winds from the Sun, because Mercury is so close, blow the atmosphere away. Therefore, all of the gases it has are from the Sun because the solar winds are constantly replacing Mercury's atmosphere.
On top of the shelves is an air vent. By going up there after you have chosen "Sample Red mercury", you can enter the crawl space, and escape. :)
The gas giant planets have stronger gravity, which makes it harder for anything to escape, and are colder, which means that even with similar gravitational fields, gas molecules might not achieve escape velocity.
By the space race
The Mercury Mariner is a compact crossover SUV that was produced by the Ford Motor Company under its Mercury marque. It was sold from 2005 to 2011 as a sibling to the Ford Escape and Mazda Tribute. It offered a comfortable ride, good fuel efficiency, and a practical size for urban driving.
No space probe has ever landed on Mercury.