Most Americans over the age of thirty think Pluto is still a planet, though 18-29 year olds are split

Tomorrow the NASA spacecraft New Horizons will fly past Pluto, providing scientists with the best images to date of Pluto. Pluto was considered a planet until 2006, after the discovery of other large objects in orbit beyond Neptune led the International Astronomical Union (IAU) to reclassify Pluto as a 'dwarf planet'.

YouGov's latest research shows that most Americans (55%) still think that Pluto is a planet while 35% think that it is 'something else'. Among Americans over the age of 30 most agree that Pluto is a planet, but under-30s are divided. 42% of Americans aged 18 to 29 think that Pluto is not a planet while 40% do think that Pluto is a planet. 

The argument over whether or not Pluto is a planet isn't completely over, however. Some scientists argue that Pluto, along with other dwarf planets such as Eris and Haumea, should also be considered planets not just 'dwarf planets'. 

Full poll results can be found here and topline results and margin of error here.

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