15 Fascinating Facts About Mercury

From the perspective of Mercury, the Sun appears twice as large as it does from Earth. Despite being the closest planet to the Sun, Venus is actually the warmest planet. Mercury is only slightly larger than our moon, with a diameter of 4,878 km.

Mercury’s year is only 88 Earth days long. The planet’s weak magnetic field is approximately 1% of Earth’s. If you weigh 100 kg on Earth, you would only weigh 38 kg on Mercury.

Mercury gets its name from the Roman god of commerce, travel, and industry, while its Greek equivalent is Hermes, the messenger of the gods. The planet’s name is likely due to its fast movement across the sky.

Mercury is one of only two planets in our Solar System without a moon, the other being Venus. Despite its proximity to the Sun, radar observations have shown evidence of water ice in the shadows of some of Mercury’s craters.

Only half of Mercury has ever been observed, and the Hubble Telescope will never be able to observe the planet due to its closeness to the Sun. As of 2012, the only two spacecraft to have visited Mercury are Mariner 10 and MESSENGER.

Mercury is the smallest planet in our Solar System, a title that used to belong to Pluto before it was reclassified as a dwarf planet. The Sun’s rays are around seven times stronger on Mercury than they are on Earth.


1. What is Mercury and where is it located?

Mercury is the smallest planet in our solar system and is located closest to the sun. It is also the fastest planet, orbiting the sun in just 88 Earth days.

2. What is the temperature like on Mercury?

During the day, the temperature on Mercury can reach up to 800 degrees Fahrenheit (430 degrees Celsius), but at night it can drop to -290 degrees Fahrenheit (-180 degrees Celsius) due to its lack of atmosphere and thin layer of insulation.

3. Does Mercury have any natural satellites or moons?

No, Mercury does not have any moons or natural satellites orbiting around it.

4. How long does it take for a spacecraft to reach Mercury?

It takes about 6 to 7 years for a spacecraft to reach Mercury due to the high speed required to reach the planet and the need to use the gravitational pull of other planets to slow down the spacecraft.

5. What do we know about Mercury’s surface?

Mercury’s surface is heavily cratered and has a large number of cliffs and mountains. It also has a large iron core that makes up about 75% of its total volume.

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