It shouldn't be so difficult to determine what a planet is. When you're watching a science fiction show like 'Star Trek' and they show up at some object in space and turn on the viewfinder, the audience and the people in the show know immediately whether it's a planet or a star or a comet or an asteroid.
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Alan Stern:
A river is a river, independent of whether there are other rivers nearby. In science, we call thingAlan Stern:
In science, we take large numbers of disparate facts and reduce them to see patterns. We use the paAlan Stern:
My field is called planetary science.Alan Stern:
Just speaking for myself, I think the return of people to the Moon has a lot to offer for understanAlan Stern:
Of course Pluto is a planet: It's massive enough to have its shape controlled by gravity rather thaAlan Stern:
Discovering that our solar system has many more planets than we ever expected, and that most of theAlan Stern:
Just because Pluto or comets aren't as big as Jupiter doesn't mean they are not scientifically impoAlan Stern:
The New Horizons Pluto mission will be the first mission to a binary object and will help us undersAlan Stern:
By going to Pluto, we have a chance to anchor, with real data, models of the early evolution of EarAlan Stern:
The Kuiper belt region, which I call the third zone because it lies beyond the rocky terrestrial pl