Leaving Earth cover

In 2019 I obtained from my former publisher the last 30 copies of the now out-of-print hardback of Leaving Earth. I sold about half of these, and with only a handful left in stock I have raised the price. To get your own autographed copy of this rare collector's item please send a $75 check (includes $5 shipping) payable to Robert Zimmerman to

Behind The Black, c/o Robert Zimmerman
P.O.Box 1262
Cortaro, AZ 85652

I will likely raise the price again when only ten books are left, so buy them now at this price while you still can!

Also available as an inexpensive ebook!

Leaving Earth: Space Stations, Rival Superpowers, and the Quest for Interplanetary Travel, can be purchased as an ebook everywhere for only $3.99 (before discount) at amazon, Barnes & Noble, all ebook vendors, or direct from my ebook publisher, ebookit.


Winner of the 2003 Eugene M. Emme Award of the American Astronautical Society.

"Leaving Earth is one of the best and certainly the most comprehensive summary of our drive into space that I have ever read. It will be invaluable to future scholars because it will tell them how the next chapter of human history opened." -- Arthur C. Clarke

Philae found!


Less than a month before Rosetta’s mission ends the spacecraft’s high resolution camera has finally located Philae in its final resting spot on the surface of Comet 67P/C-G.

The images were taken on 2 September by the OSIRIS narrow-angle camera as the orbiter came within 2.7 km of the surface and clearly show the main body of the lander, along with two of its three legs. The images also provide proof of Philae’s orientation, making it clear why establishing communications was so difficult following its landing on 12 November 2014.

The image on the right clearly shows the lander on its side with one leg sticking up, as theorized by the Rosetta engineers based on the small amount of data they had received before Philae went dead. Furthermore, the wide image at the link above shows that the lander landed exactly as predicted by data, up against a wall — in this case a large boulder — which placed it in shadow most of the time.

Pioneer cover

From the press release: From the moment he is handed a possibility of making the first alien contact, Saunders Maxwell decides he will do it, even if doing so takes him through hell and back.

Unfortunately, that is exactly where that journey takes him.

The vision that Zimmerman paints of vibrant human colonies on the Moon, Mars, the asteroids, and beyond, indomitably fighting the harsh lifeless environment of space to build new societies, captures perfectly the emerging space race we see today.

He also captures in Pioneer the heart of the human spirit, willing to push forward no matter the odds, no matter the cost. It is that spirit that will make the exploration of the heavens possible, forever, into the never-ending future.

Available everywhere for $3.99 (before discount) at amazon, Barnes & Noble, all ebook vendors, or direct from the ebook publisher, ebookit.


  • Localfluff

    This was completely unexpected, given recently outspoken expectations from the team. And it is so very well imaged! This helps not only the science quality of the radio measurements through the comet between the lander and the orbiter, but it looks good enough to add context information to the images and measurements taken from it.

    One option for the landing of Rosetta on the comet was to go all in to find Philae. Instead another landing option was chosen. Now they got both! Great! This was described in a recent Karmán lecture you can google. There’s serious talk interceded by games for the children in the audience. Do skip the games, there are serious explanations too. They gave up expectations of finding Philae. The landing will be done blindly because the solar panels have to be turned away from the Sun, the radio antenna away from Earth, in order to land the spacecraft. And then they hope that batteries will be enough, and the radio dish’s angle to Earth enough, to send back the landing data it will acquire.

  • wayne

    Localfluff– do you have that von Karman lecture link handy?

  • Localfluff

    Here it is:
    From August 11.
    Again, the speakers also entertain the younger parts of the public. That doesn’t lessen their factual explanations of the missions planned future. Karmán Lectures are by testament intended to reach the broader public. Have a look at their archive for many interesting lectures.

  • wayne

    Thank you.

  • Rodney

    I would like to think that a lesson learned for future missions would include consideration of a RTG for electrical generation.

  • wayne

    — It was a Political Decision to use solar-panels.
    If you watch that von Karman lecture on Rosetta (hat tip to Localfluff) an audience member asks about RTG’s, both the presenters stop short of saying it was “political,” but they left no doubt in my mind that using RTG’s was not politically-correct for this mission.

  • Localfluff

    I recommend everyone interested in spaceflight to follow this (almost) weekly telephone conference, FISO, Future of In Space Operations (funny acronym). A slideshow file and an hour long sound file for each of them.

    This one recently dealt with RTG production. It’s like a Rubin Goldberg machine. However, they are stepping up production and will be able to provide one Curiosity or Cassini RTG at least as soon as such mission will be launched in the next few years. The two Europa missions could have theirs, and even a mission to Uranus or so inbetween. My very relieved impression now is that this supply is kind of covered now, in the framework of planned missions.

    Europeans don’t get it for Rosetta missions because they (we, I should say) are, and rightly so, not trusted to deal with plutonium.

    Aren’t you comforted by the fact that the guy handling this stuff calls himself “MacNut”?

  • Rodney

    They found the Air France black box several years ago; too bad they can’t fish the Apollo XIII RTG out of the Pacific.

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