Pluto may have lost its status as a full-fledged planet in 2006, but that doesn't mean it's a joke of a world this April Fools' Day and the folks ... since Pluto was demoted and we think it's ...

Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...

Should Pluto be demoted? And what exactly is a planet, anyway? Ancient cultures regularly revised their answer to the last question and present-day scientists aren’t much better off: There still ...