is mercury a terrestrial or gas giant planet?
Mercury has an atmosphere (sort of):
Mercury has just 38 percent the gravity of Earth this is too little to hold on to what atmosphere it has which is blown away by solar winds. However while gases escape into space they are constantly being replenished at the same time by the same solar minds, radioactive decay and dust caused by micrometeorites
mercury is the smallest planet
information about mercury
It takes less than 88 Earth days for Mercury to orbit around the sun.
Because of a lack of an atmosphere, the temperature rises above 800°F while on the dark side it falls rapidly to -300°F.
Mercury is the most iron rich planet in the Solar System with an iron core like Earth.
Half of Mercury had never been seen
Read more: http://www.universetoday.com/13944/interesting-facts-about-mercury/#ixzz2t93qaxkI