This dime is composed of 90 percent silver and 10 percent copper. I won’t waste time going into the toxicity of the material, as this is well known and documented. Mercury has an unusually large molten metallic core made up principally of iron and nickel. Mercury’s Neighbors. It has a tenuous atmosphere made up of hydrogen, helium, oxygen, sodium, calcium, potassium and … It is small and rocky. A day on Mercury lasts 59 Earth days. Its low surface gravity makes holding on to an atmosphere in the best of circumstances a challenge. Time on Mercury. Mercury is the closest planet to the Sun and is also the smallest in our Solar System. Mercury is a shiny, silvery, liquid metal, sometimes called quicksilver.It is a transition metal with atomic number 80 on the periodic table and an atomic weight of 200.59, and its element symbol is Hg. The program included a number of unmanned test flights, some including primates, prior to flying human astronauts. Mercury is a terrestrial planet. Above the core is a 500-kilometer rocky mantle covered by a thin crust of loose rocks and dust. Mercury Program. Information about Mercury's composition is based on the Mariner 10 and MESSENGER probes that orbited the planet. While it's an extremely rare element, there's a world of interesting information about mercury. Mercury, or quicksilver as it was called several hundred years ago, derived its name from the Roman god Mercury, and has been a metal that has intrigued men since a long time. What is Mercury’s atmosphere made of? Mercury is the smallest and least massive of the eight planets. Mercury - Mercury - Surface composition: Messenger used X-ray fluorescence spectra to study the surface composition of Mercury. Mercury also has been used in Ayurvedic medicine. A year on Mercury lasts 88 Earth days. Mercury is a chemical element with the symbol Hg and atomic number 80. Conventional medical doctors have used mercury in its gross form for several centuries, and dentists started using mercury fillings in the early 1800s. Mercury is the smallest planet in our solar system. It found a high ratio of magnesium to silicon and low ratios of aluminum and calcium to silicon, which showed that the crust was not rich in feldspar like that of the Moon. It is also considered to be a rocky or terrestrial planets and its interior composition is said to be similar to that of our own planet. The coin contains a total of just over .072 troy ounces of silver. What is Mercury Made Of? It is commonly known as quicksilver and was formerly named hydrargyrum (/ h aɪ ˈ d r ɑːr dʒ ər ə m / hy-DRAR-jər-əm). (You can tell the difference by … Atmospheric components. Started in 1958, Project Mercury was the United States' first manned spacecraft program. Mercury is the closest planet to the sun. Mercury does not have any moons. 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