Mercury is the
(smallest) planet in our solar system, it is the (closest) one to the Sun.
Apart from the Sun itself the sunny side of Mercury is the (hottest) place
in the solar system. But the dark side of Mercury is probably even
(colder) than the (farthest) planet, Pluto. It is strange to find the (hottest) and
the (coldest) parts of the solar system on the same planet. The (best)
time to see Mercury is spring.