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The New Horizons space probe left Earth in 2006 and reached Neptune Monday, on its way to Pluto, which it is expected to reach in July 2015. (Photo courtesy NASA)

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The great Pluto debate is still hot

Tucson scientist joins panel touting 2015 visit to 'dwarf planet'

Tucson scientist David Grinspoon joined a panel Monday talking about NASA's New Horizons mission to Pluto