It's not known who discovered Mercury.
A year on Mercury is just 88 days long. ...
Mercury is the smallest planet in the Solar System. ...
Mercury is the second densest planet. ...
Mercury has wrinkles. ...
Mercury has a molten core. ...
Mercury is only the second hottest planet. ...
Mercury is the most cratered planet in the Solar System.
What is Mercury made of?
Mercury is a rocky planet with a huge iron core which makes up a large part of its interior. The core takes up nearly 3/4 of the planet's diameter. Mercury's iron core is about the size of the moon. Iron makes up about 70% of Mercury's total weight making Mercury the most iron-rich planet in the Solar System.
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