Because Pluto is so far away from us (5.9 billion kilometers), we do not have any pictures of its surface and we know very little about it. However, a spacecraft is on its way to Pluto in the summer of 2015. Astronomers with the help of calculations predict that Pluto has a thin atmosphere containing nitrogen. The average surface temperature is expected to be around-230'C. They predict that Pluto has a rocky core with outer layers made of ice and loose rock.
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