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Mercury has a large iron core. Astronomers estimate that the rest of Mercury is composed of heavy metals and sillicates.

en.wikipedia.org/wiki/Mercury_(element)

Mercury is a chemical element with symbol Hg and atomic number 80. It is commonly known as ..... Others applications made use of the chemical properties of mercury: The mercury battery is a non-rechargeable electrochemical battery, ...

en.wikipedia.org/wiki/Mercury_(planet)

Mercury is the smallest and innermost planet in the Solar System. Its orbital period around the ... to be factored out from both planets, the materials of which Mercury is made would be denser than those of Earth, with an uncompressed density ...

www.space.com/18643-mercury-composition.html

Oct 14, 2016 ... Mercury is a terrestrial planet with a rocky surface and metallic core.

coolcosmos.ipac.caltech.edu/ask/29-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 ...

www.kidsastronomy.com/mercury.htm

As a result, Mercury is made out of a large percentage of heavier elements, mainly iron. It is essentially a large metal ball of iron with a very thin silicate crust.

www.universetoday.com/34021/what-is-mercury-made-of

Dec 24, 2015 ... Mercury is the closest planet to the Sun, orbiting at only 57.9 million km. It's classified as one of the "rocky" or terrestrial planets of the Solar ...

www.qrg.northwestern.edu/projects/vss/docs/space-environment/2-what-are-planets-made-of.html

Earth and the other three inner planets of our solar system (Mercury, Venus and Mars) are made of rock, containing common minerals like feldspars and metals ...

planetfacts.org/what-is-mercury-made-of

The planet's core is actually made up of liquid metal which is then surrounded by a mantle that is composed of silica and a solid outer crust. In Mercury's case ...

www.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-is-planet-mercury-k4.html

Mercury is a little bigger than Earth's moon. It is made of heavier materials, like iron. But if you could weigh Mercury and the moon, Mercury would weigh a lot ...