what is mercury's core mostly made up of?
966827
Mercury consists of approximately 70% metallic and 30% silicate material. The density of the planet is the second-highest in the solar system at 5430 kg/m³, only slightly less than Earth's density.\n\nA high percentage of iron.
630681
Mercury\nIts liquid at room temperature so it has to be.
136371
Mercury has the thinnest, if any, atmosphere. It is not only a really small planet it is very close to the sun which is devastating to an atmosphere. It is possible Mercury has a thin atmosphere, like the moon, made up of sodium gas. Even if there where it would be blasted off of mercury, like it is on the moon, leaving an atmosphere so thin it is infact a more perfect vaccum than we can recreate here on earth. \n\nWe can see atmospheres on other planets when they pass by the sun or by distant stars. We see the atmosphere as a blurry boundary between the bright star and the planets disc.\n\nPluto has a very eccentric orbit around the sun and as it is (probably) made up of ice and rock (like a comet) when it´s orbit brings it closest to the sun (it gets closer then neptune) then part of its surface heats up, evaporates and becomes a thin atmosphere.
736686
Material from the sun's surface, about 75% hydrogen, 24% helium, and 1% everything else
237935
francium. mercury is technicaly not a metal, it just has a low melting point, low metling points do not make it unstable. if that were the case, then oxygen would be VERY unstable ITS ALREADY TURNED INTO VAPOR!!!
260568
Depending upon whether it is metallic mercury or a mercury compound, different rules apply.\nYou can get some ideas at the site below:
515165
its a planet that called mercury.
865526
Solid. The only liquid ones are bromine and mercury I think.\nPotassium is a soft silvery-white metallic alkali metal that occurs naturally bound to other elements in seawater and many minerals
959500
According to my sources:\n\n"Titan bulk composition is half water ice and half rocky material. It is probably differentiated into several layers with a 3400 km (2,040 mi) rocky center surrounded by several layers composed of different crystal forms of ice. Its interior may still be hot and there may be a liquid layer consisting of water and ammonia between the ice crust and the rocky core."\n\nThere is also a picture to the right that you can click on to make larger so see the relative concentrations of materials in the moon's physical makeup.\n\nAlso, my sources go on to say:\n\n"The Cassini mission has revealed that Titan's surface is relatively smooth."
588354
might be  mercury compound(only  Mercury can dissolved gold))
487836
mercury is one of five elements that are liquid at or near standard room temperature (the others are the metals caesium, francium, and gallium, and the nonmetal bromine). ...
712651
Mostly hydrogen, some helium, and relatively small amounts of various other elements.
310415
the atmosphere is made mostly of hydrogen and helium but contains trace amounts of methane, water vapor, and ammonia. For futher information go here: http://en.wikipedia.org/wiki/Jupiter_(planet)#Atmosphere
224377
No. In general, the inner planets of a solar system will be made up of heavy metals, while the lighter elements will be found in the outer planets. Jupiter, for example, has a core of liquid hydrogen.
973894
float as mercury has a density of about 13.6gm/cc and iron much lesser 7.85gm/cc. Mass is immaterial as  in a sufficient quantity of mercury even a 1000000000000kg iron ball will float
311127
maybe its inside or core is solid and as big as the earth's moon. But the whole of it is gaseous
517398
Magnesium and trace amonts of mercury.