Astronomers can't seem to agree on what, exactly, a planet is. Is it simply a round thing in orbit around a star? Or something more? And is Pluto a planet or not?
BREAKING NEWS - PLUTO IS NOT A PLANET
Follow the fierce debate LIVE in our newsblog from the International Astronomical Union meeting in Prague this week.
http://blogs.nature.com/news/blog/conference_reports/international_astronomical_union/
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