Mercury is the planet closest to
the Sun in our Solar System. This
small, rocky planet has almost no
atmosphere. Mercury has a very
elliptical orbit and a huge range in
temperature. During the long daytime
, which lasts 58.65 Earth days or
almost an entire Mercurian year,
which is 88 days long, the
temperature is hotter than an oven;
during the long night (the same length,
the temperature is colder than a freezer.