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beautiful discovery!
http://science.nasa.gov/science-news/science-at-nasa/2012/29nov_iceonmercury/
http://science.nasa.gov/science-news/science-at-nasa/2012/29nov_iceonmercury/
Ice forms on Mercury in polar crater shade because the temperature in these areas can drop below -200 degrees Celsius, which is cold enough for water to freeze. Mercury's axial tilt is minimal, so the poles are always in shadow, preventing the ice from melting.
The polar craters on Mercury are located at high altitudes, which means they receive less direct sunlight and are therefore colder. Additionally, the planet's extremely thin atmosphere does not provide much insulation, allowing the temperatures to drop low enough for ice to form.
The ice on Mercury's polar craters is primarily composed of water ice, with some traces of other volatile compounds such as carbon dioxide and methane. Recent studies have also suggested the presence of organic compounds in the ice.
The presence of ice on Mercury's polar craters was first discovered by the MESSENGER spacecraft in 2012 through the use of a neutron spectrometer. This instrument was able to detect the presence of hydrogen, which is a key component of water, in the polar regions of the planet.
The presence of ice on Mercury's polar craters has significant implications for future exploration of the planet. It could potentially provide a source of water for human settlements and fuel for spacecraft, making it a valuable resource for future missions. It also raises questions about the planet's past and the possibility of life existing on Mercury.