
The great debate continues and the tender crushed hearts of school children are again torn asunder by scientists who "vote" on whether or not the definition applies. There is no scientific consensus, really. Those of us who learned there were 9 planets orbiting the Solar System when we were in school still harbor that secret magic number. The US State of New Mexico's legislature resolved that Pluto is still a planet.
HOW DO YOU FEEL ABOUT PLUTO?
PLANET or DWARF PLANET or 9th ROCK FROM THE SUN?
Scientists are torn because there are Kuyper Belt Objects (KBO's) larger than Pluto out there in the further reaches of the Solar System. The New Horizons Mission to Pluto may stir the hearts of scientists to reconsider their harsh down-grade. There's also the dwarf planet, Ceres, that is orbits in the asteroid belt between Earth and Mars. The Dawn Mission to Ceres is likely to create a groundswell of support for calling Ceres a planet when we take a closer look at the place.
In order to be classified as a "genuine" planet, the object must be:
- Massive enough that gravity crushes it into a round(ish) sphere. (Pluto is smaller than Earth's Moon)
- It must orbit the Sun.
- It must be dominant enough that it clears away objects in its orbital space. (this is the sticking point, apparently because scientists can't agree on the cleanliness of Pluto's orbital path)
Sound off here: Planet/Not a Planet??