Of course Pluto is a planet: It's massive enough to have its shape controlled by gravity rather than material strength, which is… — Alan Stern Copy Share Image
If you put Earth out beyond Neptune, you wouldn't be able to call it a planet because it couldn't clear its zone. — Alan Stern Copy Share Image
No one predicted Mercury would be a planetary core with the mantle stripped off. No one predicted volcanoes on the Jovian moons,… — Alan Stern Copy Share Image
It shouldn't be so difficult to determine what a planet is. When you're watching a science fiction show like 'Star Trek' and… — Alan Stern Copy Share Image
To say that what a planet is doesn't matter would be to imply that a planetary scientist couldn't explain to someone what… — Alan Stern Copy Share Image
In the mind of the public, the word 'planet' carries a significance lacking in other words used to describe planetary bodies... many… — Alan Stern Copy Share Image
I'm the one who originally coined the term 'dwarf planet,' back in the nineteen-nineties. — Alan Stern Copy Share Image
Competition-driven innovation and price pressure that commercial practices foster can only make human spaceflight ever more common and U.S. leadership in this domain ever… — Alan Stern Copy Share
Of course Pluto is a planet: It's massive enough to have its shape controlled by gravity rather than material strength, which is the hallmark… — Alan Stern Copy Share
It used to be said that Pluto is a misfit. But now we know Earth is the misfit. This is the most populous class… — Alan Stern Copy Share
The Kuiper belt region, which I call the third zone because it lies beyond the rocky terrestrial planets and beyond the giant planets, is… — Alan Stern Copy Share
I think if you were between maybe 6 and 16, there was nothing like Apollo, and I wonder if there can be something like… — Alan Stern Copy Share
If you put Earth out beyond Neptune, you wouldn't be able to call it a planet because it couldn't clear its zone. — Alan Stern Copy Share
When we first sent missions to Jupiter, no one expected to find moons that would have active volcanoes. And I could go down a… — Alan Stern Copy Share
Pluto is still active four and a half billion years into its history. It was expected that small planets like Pluto would cool off… — Alan Stern Copy Share
The Kuiper Belt is the largest mapped structure in our planetary system, three times as big as all the territory from the sun out… — Alan Stern Copy Share
If two billion people wanted to watch a robot fly by Pluto, imagine what it will be like when the first humans step on… — Alan Stern Copy Share
To keep everyone invested in your vision, you have to back up a little bit and really analyze who the different stakeholders are and… — Alan Stern Copy Share
We're going to find Marses and maybe Earths out in the solar system's attic of the Oort Cloud and the Kuiper Belt. — Alan Stern Copy Share
One of the implications of the discovery of the Kuiper Belt and its many small planets is that many scientists now think of the… — Alan Stern Copy Share
CASIS has to succeed because for it not to succeed would be a huge setback for the International Space Station program. — Alan Stern Copy Share
