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

On the radio

I will be doing a quickly scheduled appearance with Robert Pratt at 5 pm (Central) today on his Pratt on Texas radio network, airing across the Lone Star State. You can listen live here or from an affiliate station available here.

The interview is scheduled for 30 minutes, but it could go longer. The subject will be the muzzle of oppression that so many Americans are now willing to put on their faces.

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.


  • Robert Pratt

    Thanks Bob, as always it was a pleasure to have you on.

  • Robert Pratt: And as always, it was a pleasure to visit with you. If a podcast of today’s show becomes available, please let me know and I will post a link to it here.

  • mkent

    The subject will be the muzzle of oppression that so many Americans are now willing to put on their faces.

    Wow! On the day that America sets a new single-day death record for Covid-19, you go on the radio to denounce one of the simplest ways for Americans to reduce the spread of this disease. What timing!

    How many bodies have to pile up before you admit you are wrong?

  • janyuary

    Mkent, I marvel at how all around me these people are supposedly dying in record numbers, which necessarily means that three times as many people must be getting very very sick and surviving …. I marvel at how I personally know ZERO who’ve been killed or e even made ill beyond mild flu.

    Mkent, I remember the first real pandemic I ever experienced, when I was 11 years old. I knew lots of people, all ages, who got sick, and that continued over flu seasons of the next 50 years. I have lived in very heavily populated port towns so we were the first to get “new” viruses and the regional industry (fishing) was very very high risk, so the “risk” of getting this season’s flu was laughable in context.

    Now you can write it off as “empirical” evidence that’s worthless and go on believing purely on what doctors and politicians tell you (those are the ones telling you that all these people are dying) as opposed to what your eyes, math skills, and personal experience tell you.

    Easily gulled, inexperienced people are free to believe what they want but they are dangerously wrong in trying to force their beliefs on “non believers” or “deniers” of whatever term bullies choose. Be responsible for your own health, fear, and beliefs and STOP trying to force others to conform to your beliefs.

    Live and let live, mkent.

  • Edward

    If those masks work, then why didn’t they work over the summer? And why aren’t they working now? If masks worked, then Wuhan would have virtually disappeared over the summer, like every flu does. Instead, the empirical evidence is that they are worse than useless and cause more spread.

    We are supposedly wearing all these masks in order to save just one life. What will that life finally be saved so that we can stop all these deadly reactions to this not-as-deadly-as-the-reactions flu?

    How many more bodies have to pile up before you admit you are wrong?

Readers: the rules for commenting!


No registration is required. I welcome all opinions, even those that strongly criticize my commentary.


However, name-calling and obscenities will not be tolerated. First time offenders who are new to the site will be warned. Second time offenders or first time offenders who have been here awhile will be suspended for a week. After that, I will ban you. Period.


Note also that first time commenters as well as any comment with more than one link will be placed in moderation for my approval. Be patient, I will get to it.

Leave a Reply

Your email address will not be published. Required fields are marked *