Articles on Dwarf planets

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Pluto in enhanced color, to illustrate differences in the composition and texture of its surface. NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute

I’ve Always Wondered: How do we know what lies at the heart of Pluto?

Pluto has a density between that of rock and ice – so that immediately suggests the dwarf planet is made of a mix of both. But how do we know?
Pluto is a dwarf planet but that doesn’t make it any less worthy of our attention. NASA/JHUAPL/SwRI

Planet or dwarf planet: all worlds are worth investigating

A group of astronomers are trying to reclassify Pluto as full 'planet'. But there are good reasons to leave our classification system alone, and this doesn't mean Pluto is any less interesting.
Artist’s impression of New Horizons as it swings past the dwarf planet Pluto, in July 2015. NASA

Rise and shine! New Horizons awakes ahead of a date with Pluto

While the Mars Rovers and the Rosetta spacecraft will continue to make headlines in 2015, the stage is set for the solar system’s next great mission – the Pluto-bound New Horizons. Discovered in 1930…

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