Mercury was once expected to be far too hot for ice, sitting closest to the Sun — but radar observations revealed bright patches near its poles, and NASA’s MESSENGER spacecraft later confirmed that many of them were water ice, preserved inside craters whe
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Mercury, the planet closest to the sun, was found to have water ice near its poles, preserved inside craters. This discovery was made possible by radar observations and later confirmed by NASA's MESSENGER spacecraft. The presence of ice on mercury is notable given its proximity to the sun and expected high temperatures.
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