- Size
Mercury is the smallest planet in the Solar System in mass and diameter. It is slightly larger than Earth’s Moon. - Heat
Mercury’s surface temperatures range from −173 degrees C at night to 427 degrees C during the day. This is because the planet does not have the atmosphere to trap heat, and the energy from the sun is rapidly lost during the day. - Day & Year
A single year is only 88 days on Wednesday. But due to its slow rotation, one rotation takes 59 Earth days (58d 15h 30m). - What is Mercury made of?
It consists mainly of iron, nickel and silicate rock. The dry, rocky surface of the planet is filled with craters like our moon - color
Mercury is primarily dark gray - Satellites: None
- Distance
From Sun: 59.795 million km
From Earth: 119.24 million km - Discovered:
It is believed to have been first recorded in 265 BC. Because Mercury is so close to the Sun, it is often obscured by its brightness. Mercury was first observed with a telescope by Galileo Galilei and Thomas Harriet in the 17th century.
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