Pluto

I'm really wishing that people would grow the hell up about Pluto.

Yes it was a planet and now it's been demoted. But for pity's sake it's not like scientists have said "We don't need it anymore" and found a way to chuck it out of the solar system. It's still there people and scientists still have an interest in it.

They're even an ongoing mission called "New Horizions" which is a probe that was launched in 2006 and at this time halfway to Pluto.

When Pluto got demoted, we had no real definition as to what a planet was apart from the original definition of "Wanderer".

planet (n.) 

late Old English planete, from Old French planete (Modern French planète), from Late Latin planeta, from Greek planetes, from (asteres) planetai "wandering (stars)," from planasthai "to wander," of unknown origin, possibly from PIE *pele- (2) "flat, to spread" on notion of "spread out." So called because they have apparent motion, unlike the "fixed" stars. Originally including also the moon and sun; modern scientific sense of "world that orbits a star" is from 1630s.

Please note that last bit..."Originally including also the moon and sun". Meaning that anything in the sky orbiting around was at one point considered a planet or a wanderer.

So scientists got together and decided to define what a planet means scientifically. A planet is now considered to be an astronomical object orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighboring region of planetesimals.

Pluto only manages two of the three. It has not cleared its orbital path. 

But that's not the end of poor Pluto as an object of interest. Yes it was demoted, but it was the first of a new class of orbital objects floating around out there. It became the first Dwarf Planet. And more to the point, it pioneered the way for four more objects to be classified. Ceres which is the big honking asteroid in the belt between Mars and Jupiter is large enough to have rounded itself and so is a dwarf planet as well. And out near Pluto are three others. Haumea, Makemake, and Eris. 

So we lost a planet. So poor Pluto was demoted. Four more objects were promoted from interesting and named rocks to planets. Dwarf planets perhaps...but yet another class of planet. So we went from nine to thirteen critters out there.

You would think that would be a scientifically interesting thing.

And there is talk about changing the definition of planet once again. After all, Jupiter, Saturn, Uranus and Neptune have little in common with planets like Mercury, Venus, Earth and Mars. Hell we have more in common with the Dwarf Planets than we do with the gas giants. So we may end up with three classes of planet. Dwarf, Rocky, and Gaseous. None of which changes the fact that we have thirteen named, Sun-orbiting objects out there. 

So give it up people. Neil DeGrasse Tyson didn't "kill" Pluto and scientists aren't going "Well it's not a planet so fuck it." and are losing all interest in it. Pluto is here to stay and it's still an interesting and important part of our Solar family.