Venus is hotter than Mercury.
Why it is true
Despite being further from the Sun, Venus has a thick atmosphere full of greenhouse gases that trap heat, reaching 465°C.
Source: Astronomy
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.