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Triple J: Why is Pluto not a planet?

Watch this clip and learn why Pluto was taken off the official list of planets. Dr Karl Kruszelnicki explains the three criteria that must be met before planets can be called planets. What are they?

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Solar wind gives asteroids a tanning

This brief ABC News in Science article from 2009 explains that asteroids become redder the longer they stay out in the sun because of the solar wind. Scientists are using this to try to find our more about our planetary origins.

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Orrery, c1770 - part 1

This is a close-up of a mechanical model of part of the solar system, commonly known as an orrery, made by renowned London instrument maker Benjamin Martin in about 1770. This bronze model features a cylindrical clockwork mechanism with an orb representing the Sun placed in the centre. Extending from this on an arm is a ...