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Pluto's composition is not very well known since it is so far away from Earth. Astronomers believe that it's mostly made of rock and frozen methane, water, nitrogen and carbon dioxide. This is probably covered by a thin atmosphere of methane gas.

en.wikipedia.org/wiki/Pluto

Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of ... Like other Kuiper belt objects, Pluto is primarily made of ice and rock and is ... Unknown to Lowell, his surveys had captured two faint images of Pluto on March 19 and April 7, 1915, but they were not recognized for what they were.

coolcosmos.ipac.caltech.edu/ask/163-What-is-Pluto-made-of-

Pluto is thought to be made of mostly ice. It probably also has a small rocky core which might contain some metals. The ice on the surface of Pluto is made of ...

www.space.com/18562-what-is-pluto-made-of.html

Feb 19, 2016 ... NASA's New Horizons spacecraft captured this image of an intriguing "X" on Pluto's icy Sputnik Planum region; the X probably marks a spot ...

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

An object in orbit is called a satellite. A satellite can be natural, like the moon. It can be human-made, like the space station. Earth is a natural satellite of the sun.

www.universetoday.com/13875/what-is-pluto-made-up-of

Apr 25, 2008 ... No longer a planet, Pluto is just a member of the Kuiper Belt; a collection of icy objects that extend out past the orbit of Neptune. If you brought ...

www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-pluto-58.html

Pluto is a dwarf planet that orbits beyond Neptune. ... The spacecraft made its closest approach on July 14, 2015. ... Space Place: What Is the Kuiper Belt?

scienceline.ucsb.edu/getkey.php?key=3990

Pluto does contain rock, but much of its surface is thought to be made up of frozen ... and guess what Pluto is made out of, we haven't been able to visit Pluto yet.

moonphases.info/what-is-pluto-made-of.html

We can only guess what Pluto is made out of. Pluto is a very tiny small planet that cannot be seen with the naked eye. Even if you use regular telescopes, you ...

www.reference.com/science/pluto-made-22895e67610f9c0

Although no one knows exactly what Pluto is made of, most scientists agree that it is between 50 and 70 percent rock, with the remainder being composed of ...