It's the closest planet to the sun, so the "day" side gets HOT.
(it has a very slow rotation, about 2/3 of its year)
while the night side gets to radiate heat into outer space
(there's no atmosphere to help trap any of that heat).
We have two such planets in the solar system, which are Mercury and Venus. There are also several other planets that have no oceans but which are cold.
The other two planets are Mercury and Venus.
It's mainly to do with its closeness to the sun, compared with the other planets. Although mercury is closer, Venus is hotter due to it's thick carbon dioxide atmosphere, which holds the energy from the sun a lot better than mercury, which has no atmosphere.
stuff
mercury is very very heater than other planets
The average temperature on earth was 14 or 15 °C (57-59 °F), much hotter on Venus and half of Mercury and much colder on the other half of Mercury, Mars, and the outer planets.
Because of Earth's size, and considering it as one of the smallest planets, it has a weak gravity compared to the OTHER planets. Most planets have greater gravity because of their size. Earth has a stronger gravity compared to mars, mercury, and venus.
Earth, Venus, and Mercury are also inner planets.
Planet (in order from sun)Average temperature in KelvinAverage temperature in 'CRanked in order of coldest to hottestMercury*340677Venus7354628 (hottest)Earth287.214.056Mars210-635Jupiter**165-1084Saturn**134-1393Uranus**76-1972Neptune**72-2011 (coldest) *This is the average temperature at the equator. Unlike the other planets Mercury has a huge range in surface temperature due to lack of atmosphere. At the equator, the surface temperature on Mercury can range from 100K (-173'C) to 700K (430'C). **temperature at the 1.0 bar pressure level
Mercury,Venus ,Earth and Mars are rocky planets and are made of rocks. On the other hand Jupiter,Saturn,Uranus and Neptune are gaseos planets and made up of liquids.Planets also have temperature and size difference.
Mercury, Venus, Earth, and Mars are called the inner planets.
Mercury and Venus have no known satellites, all other planets have at least one.