I think they should make Pluto a planet again because:
(1) It revolves around the sun, which is basically the DEFINITION of "planet."
(2) It's been a planet for 76 years. Why change it now? Four generations of kids were taught that there were nine planets, and now all the good mnemonic devices we have don't work. Sure, we have "My Very Excellent Mother Just Served Us Noodles," but we didn't spend a kazillion years of school learning that, did we?
(3) NASA is still studying it, which is a key criteria (what is the singular of "criteria?" Criterium?) of planets. If they treat it like the other eight planets by studying it and/by sending robots to it, they might as well make it a planet. The idea of "dwarf planets" is just stupid. MAKE PLUTO A PLANET AGAIN!!!
Once this petition gets 100 signatures, I will send it to NASA and the IAU (International Astronomical Union). As of May 31, we have:
 20 signatures
 30 signatures
 40 signatures
 50 signatures
 60 signatures
 70 signatures
 80 signatures
 90 signatures