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How big is Mercury?

Mercury is 4,900 kilometres

Mercury: A Tiny Planet with a Big Impact

Have you ever wondered about Mercury, the smallest planet in our solar system? This little planet sure packs a punch! Despite its small size, Mercury is dense enough to have roughly the same surface gravity as Mars. That’s pretty impressive, right? In this article, we’re going to explore more about Mercury, especially focusing on its size and how it compares to other objects in our solar system.

Size of Mercury

To give you an idea of how small Mercury is, imagine if Earth was the size of a basketball. In comparison, Mercury would be about the size of a baseball. With a mean diameter of 4,880 km, it’s only 38% the size of Earth. That’s pretty small for a planet!

  • Mercury’s size is smaller than Earth’s moon, which has a diameter of 3,474 km. - Despite being the smallest planet, it’s still bigger than some of the largest asteroids, like Ceres, which has a diameter of about 940 km. - It’s also bigger than Pluto, which is classified as a dwarf planet and has a diameter of about 2,377 km. One interesting fact about Mercury is that its small size doesn’t mean it’s lightweight. It’s actually quite dense, with a density of about 5.427 g/cm³. That’s only slightly less than Earth’s density, which is 5.515 g/cm³!

Mercury’s Comparison to Other Planets

When compared to other planets in our solar system, Mercury is the closest to the Sun. This makes it have some pretty extreme temperatures. During the day, the temperature can reach up to 427 °C (800 °F), while at night it can drop to a freezing -173 °C (-280 °F).

  • Mercury is only about 1/3 the size of Earth. - Despite its small size, it’s still bigger than Mars, which is only about half the size of Earth. - It’s also much smaller than the largest planet in our solar system, Jupiter, which is a whopping 11 times the diameter of Earth.

Inside Mercury

Mercury isn’t just interesting on the outside, it’s also fascinating on the inside! This small planet is believed to have a solid silicate crust and mantle overlying a solid outer core. Deeper inside, it has a liquid core layer, and a solid inner core. Despite being the smallest planet, Mercury has a magnetic field. However, its strength is only about 1% of Earth’s magnetic field. This is pretty amazing considering the size of the planet. In conclusion, while Mercury might be the smallest planet in our solar system, it’s quite fascinating. Its size, compared to other planets and objects, makes it unique. So the next time you look up at the sky, remember that even the smallest planet can have a big impact!

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