NASA's Alan Stern talks Pluto ... and beyond
| Boulder, Colo.
There were some tense hours at the operation center for the New Horizons mission when the spacecraft briefly lost contact with Earth on July 4, 2015, just days from its long-awaited flyby of Pluto.听It鈥檚 just one of many gripping moments in a book that Alan Stern, the mission leader and a co-author of 鈥淐hasing New Horizons鈥� along with astrobiologist David Grinspoon, describes as a 鈥渢echno-thriller about how the farthest planet was explored.鈥�
Dr. Stern recently sat down for an interview in his Boulder, Colo., office, surrounded by photos and mementos from the New Horizons mission 鈥� a mission that took decades to convince NASA to get off the ground and another decade to travel 3 billion miles to the last unexplored planet in our solar system. The New Horizons spacecraft continues to explore the vast reaches of the Kuiper belt, at the outer edge of our solar system.听His responses have been edited for clarity and brevity.听
Q: What inspired you to become a planetary scientist?
Why We Wrote This
Pioneering spacecraft often get the credit for new discoveries made in space. But behind every mission to space are people 鈥� scientists and engineers 鈥� whose decades of work make those discoveries possible.
I got interested in part because I have a mind that is a scientific mind. But I remember being 8 or 12 years old and thinking, 鈥淚f I could only grow up and work on this. This is important. This is the future.鈥澨�
When I grew up there was this interesting m茅lange of science fiction in movies like 鈥�2001: A Space Odyssey鈥� and the television series 鈥淪tar Trek鈥� that were about this future in which humans were all over, in one case the solar system and in the other, the galaxy. At the same time, it was very clear that the beginning steps of that were taking place. People were going into orbit, and going to the moon, and space ships were being fired off at Mars and Venus and Jupiter and Mercury. And those two dots got connected by a lot of kids, that there was a real thing going on and you could see where it was going in the distant future, and like myself, a lot of people were just intoxicated by that cocktail of reality and the future projection.
Q:听What was it like having Pluto, and New Horizons, dominate your career for so many decades?听
There couldn鈥檛 have been anything more rewarding. To be on a first mission 鈥� it鈥檚 what planetary scientists live for. We got to run anchor leg in a 50-year relay. I often say, 鈥淟ook at that, the solar system saved the best for last.鈥�
Q:听What findings from the mission stand out?
I always say there are three things, two scientific and one otherwise. There were the meta-results showing that small planets can be as complex as big ones. And all the textbooks would have told you Pluto will be geologically inactive. But instead Pluto is actually highly geologically active.
The third thing we discovered was how much it affected people. None of us on New Horizons expected the kind of public response and the personal stories of how it changed some lives. In the book we called it a final discovery.听The last words of the book are David and I saying, we think this is more important than everything else that we did.
Q:听What do you think about Pluto鈥檚 鈥渄emotion鈥� from planet status by the International Astronomical Union?听
It鈥檚 wrong scientifically, and I call it pure 鈥淏S鈥� 鈥� bad science. It was very hurtful to a lot of people on the team because what we worked on very hard was made the subject of jokes, and we thought we were doing this Olympian thing. But by the time it was all done I don鈥檛 think it mattered; virtually no one who does research on Pluto calls it anything but a planet.
Q:听How do you weigh the scientific use of a mission against the pure exploratory value?
It boils down to the tension between your head and your heart. And they鈥檙e not mutually exclusive. The fact that this had both made it all the better.
When I was growing up as a little kid and I鈥檓 watching human space flights and first missions to everywhere, I thought it seems so obvious, why would you not finish what you started, why would you leave one planet left? Just for the exploration.
Then here I am getting out of graduate school and I find out that no, it has to have a scientific case, it has to pass muster at these formal levels.
For the first mission, it seemed to me like the exploration value alone was sufficient. But it wasn鈥檛. So we had to win it on both fronts. And it was even harder because it was far away, and听a lot of people wanted to do things that would yield more immediate returns.
Q:听What do you see as the next big space exploration?听
We鈥檝e hardly scratched the surface. There will be new missions to the Kuiper belt, either to other planets in the Kuiper belt or to go back to Pluto. At the same time, the field is very interested in the next stage of Mars exploration. That will include sending humans and things you can鈥檛 do with robots.
We鈥檙e developing this whole ocean worlds initiative. There鈥檚 already a mission to [Jupiter鈥檚 moon] Europa, and we鈥檙e looking at other ocean worlds.
The planetary program at NASA is currently in a golden age. I think we were some bit of help to that, and lot of other missions were, too.
Q:听What was it like being on a mission that took 10 years from launch to Pluto flyby?听
We knew what was waiting at the other end of the line, and we couldn鈥檛 wait to get there. The whole project was about delayed gratification. But the mission just physically, even if it had been trivial to get it started, it still would be one of these things where you fire it, and you have to go to the far end, to the frontier, to start. Then the Kuiper belt mission 鈥� that鈥檚 from 2016 to 2021, and probably will go another few years until we pass out of the Kuiper belt 鈥� that鈥檚 what we came to do. That鈥檚 what we built this for. That鈥檚 what we fought to get it for. So now that we鈥檙e there, it鈥檚 like being the proverbial kids in the candy shop.
