Saturday, May 26, 2018

Tom Siegfried, former editor of Science News: Pluto's Demotion Ignores Astronomical History

They keep on coming! Here is yet another terrific article about the issue of planet definition and the many problems with the 2006 IAU definition, this time by Tom Siefried, former editor of Science News.

Siegfried's article refers to a new scientific paper by Philip Metzger, Mark Sykes, Alan Stern, and Kirby Runyon, which can be found at

Thursday, May 17, 2018

An organically grown planet definition: From Astronomy magazine

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Wednesday, May 9, 2018

Chasing New Horizons: An epic exploration to a strange new world

Chasing New Horizons: An epic exploration to a strange new world

Close to three years after the historic New Horizons Pluto flyby wowed the world, mission principal investigator Alan Stern and astrobiologist and mission science team member David Grinspoon tell the riveting story of a monumental exploration 26 years in the making in their new book Chasing New Horizons: Inside the Epic First Mission to Pluto.

Much like a novel, the book starts with a crisis, the loss of contact with the spacecraft just ten days before the flyby, then goes back to the beginning of everything and narrates the story chronologically, from Stern’s birth through the first thoughts of a Pluto mission just as Voyager 2 visited Neptune in 1989, and the many twists and turns, setbacks and victories that culminated in the triumphant 2015 Pluto flyby.

Stern and Grinspoon are scientists, yet this book is first and foremost a narrative, one that takes readers along on a multi-decade effort that started as a vision by young scientists whose efforts were stymied by a powerful and often set-in-its ways establishment.

From the initial “Pluto Underground” visionaries to the steadfast team members who overcame what seemed like never-ending challenges, readers are familiarized with the many resourceful, persistent characters who made the mission happen, to the point that it feels like we know them personally and are there with them during the journey.

At times, Stern and Grinspoon make references to popular science fiction such as Star Wars and Star Trek, an interesting choice given that Chasing New Horizons often reads and feels like a Star Trek movie. Like chief engineer Scotty, the mission team always manages to find a way to work within what seem to be impossible limitations in terms of time and budget.

One problem is successfully dealt with only to lead to another. If just one of many cancellations or crises or decisions had gone a different way, there would have been no Pluto mission at all, the writers note while recounting each of the do-or-die moments.

Much like the discovery of Pluto itself by Clyde Tombaugh, the story of New Horizons is a tale of persistence. When he arrived at Lowell Observatory in 1929, Tombaugh was told by a professional astronomer that he was “wasting his time” searching for an undiscovered planet. In 2000, after Stern’s team had worked on a mission proposal for 18 months, NASA Associate Administrator for science Ed Weiler canceled the entire Pluto project, declaring it “dead, dead, dead.”

But the “Pluto Underground” refused to accept a death sentence. Humorously, the writers titled the chapter immediately following this declaration, “The Undead.”

In total, proposed Pluto missions were canceled five times. If not for the incredible persistence of those committed to making one happen, the world today would still know little about this mysterious world.

“We really need an orbiter that can map 100 percent of everything in the Pluto system. We want to bring radar to look down to the ice; we want to bring mass spectrometers to sample the atmosphere; we want thermal mappers,” Stern told Spaceflight Insider, New Horizons raised so many questions about Pluto and its moons that Pluto scientists are already laying the groundwork for a Pluto orbiter.

By raising the strong possibility that Pluto has a subsurface ocean, the mission has put Pluto on the radar screen of scientists who study ocean worlds and want to visit a broad sample of these worlds, Stern noted.

New Horizons was about more than science; it was about the motivation to explore a “strange new world,”to “go where no one has gone before.” The motivation to explore kept the dream alive even when everything seemed lost.

When it finally happened, the flyby was as much about aesthetics and beauty as it was about science, Stern and Grinspoon note. With its diverse surface features and iconic heart-shaped region named for Clyde Tombaugh, Pluto turned out to be a beautiful, breathtaking world.

Recounting an especially poignant moment in the epilogue “Coda: A Final Discovery,” Stern and Grinspoon recount New Horizons’ unanticipated human impact as a new generation’s Apollo experience with a moving story about how the flyby inspired a Florida teenager to go from failing school to being an A student upon deciding he wanted a career in space exploration.

“The book is really an adventure story about how a bunch of young scientists who were determined managed to overcome the system and make the farthest exploration in the history of human exploration. And it’s a story about how you build space missions and plan flybys and also about the science,” Stern said. “It’s three stories woven together.”

Monday, May 7, 2018

"Yes, Pluto is a Planet"--Terrific Washington Post Article by Alan Stern and David Grinspoon

This Washington Post article by Alan Stern and David Grinspoon does a great job in presenting the case for Pluto's planet status. This is a must read for Pluto supporters and advocates of the geophysical planet definition.

Monday, April 30, 2018

Chasing New Horizons by Alan Stern and David Grinspoon

Chasing New Horizons: Inside the Epic First Mission to Pluto, co-written by New Horizons principal investigator Alan Stern and David Grinspoon, a member of the New Horizons science team, will be published and available for purchase as of May 1, 2018. I am currently reading the book, which I will review for Spaceflight Insider, which I will then link to this blog.

The fascinating story of New Horizons is a tribute to the persistence and passion of the scientists who first came up with the idea of a mission to Pluto--all the way back in 1989!

Learn more about the book and order it from its official page at .

The book has a Facebook page at

A schedule of Stern and Grinspoon's book tour can be found at . At the bottom of this page, you can sign up for regular email updates on the authors' book talks and related events.

Major congratulations to Stern and Grinspoon on the book's publication. Like all things Pluto, the New Horizons mission has an inspiring and exciting story.