There is water ice on the planet Mercury.
Why it is true
Despite being the closest planet to the Sun, Mercury has water ice in polar craters, where sunlight never reaches. The MESSENGER probe confirmed the presence of ice in 2012.
Source: NASA
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.