Sunday, November 28, 2010

I Guess "It's Not Junk" Is Just Too Visionary

Last week I attended a different kind of space conference. It was populated with very intelligent people who are active in doing "real" space, working payloads to get them accepted to fly on government vehicles - often up to the International Space Station - or as free flying satellites. I recorded 17 videos of the event, which I found enthralling, but I'm weird like that.

The best talk (in my opinion) was given by Dr Alice Gorman of Flinders University (Australia) about achieving an international agreement on Space Heritage. The presentation was aimed at preserving historic sites related to human spaceflight so that future generations have some physical connection with the past. This is something we do well in Australia, with "heritage listing" enforced by law. Of course, there's not that many sites that one might consider space heritage in Australia, a few radio telescopes that were used during Apollo - one that has already been heritage listed - but that's about it. The presentation went on to suggest that objects in orbit and on the surface of the Moon deserve as much respect as objects on the ground and the international agreement being sought was on how to define a "heritage site" that is off the Earth.

After the talk, some rather pointed questions were asked, and some rather pointed answers were given, then we broke for coffee. Over biscuits I stuck my head into a conversation with a PhD from Australia, another PhD from Europe and the head of a Japanese space company - his major objection was the use of the words "common heritage of all mankind" in the discussion of space heritage and all of a sudden I was feeling at home.. I expected to hear the old arguments about the United Nations Convention on the Law of the Sea, and the International Seabed Authority.. and I wasn't disappointed. What soon followed was some discussion about the private ownership of celestial bodies and yadda, yadda, yadda, you've heard all this before right?

In a way, it's nice to know that the "smart kids" are having the same conversations as the rest of us.. in a way. An argument which hasn't completely entered the standard model just yet is the suggestion that recycling satellites, spent propulsive stages and other sorts of "space junk" may be a critical part of a future space-faring civilization. No doubt, my presentation of the argument was probably a little rough, but I was surprised to lose just about everyone after the first breath. The fellow Australian was the first to break the silence suggesting that "it's going quite fast you know" as if I had just suggested the use of warp drive to catch the attention of a passing Vulcan spaceship.

Perhaps I shouldn't have labored the point, but I couldn't help myself. I started talking about the delta-v requirements of deorbiting GEO junk vs placing it into a super-synchronous graveyard orbit.. their eyes glazed over. Really? I'd just listened to four hours of ISS payload integration, the difficulties of sterilizing seeds for export, space weather detection, etc, and a little orbital mechanics is too boring?

This isn't the first time I've heard people scoff at the notion of recycling already on-orbit assets. At the New Space conference back in July a number of people said they had switched off when one of the panels started talking about it, as "they clearly don't understand orbital mechanics". It's frustrating. I don't claim to be an expert on the subject, but having actually done sufficient study (and written code) to calculate trans-lunar injection and other maneuvers, predict the trajectories of asteroids, and even change them to be more favorable for human missions, I really can't see what's so wrong with the idea of recycling valuable space assets.

If you're living in a space colony in GEO, it seems obvious that you would take whatever mass you could get for free, especially if it is highly refined solar panels and other materials. If you're living at one of the Lagrangian points you'd have to have vehicles capable of 4 km/s of delta-v and a steady supply of propellant or the means to produce it from water stocks, why wouldn't you go scavenging in the graveyard orbits for tanks and rocket nozzles to keep those vehicles operational without paying for expensive replacement parts from Earth?

Although I appreciate and respect the practicalities and even the horse trading of real space, I don't think we need to close our minds to future possibilities, as the decisions we make today, with good intentions or bad, will make that future.

Monday, November 15, 2010

The Space Industry



Here's a great video by Bob Stover, Tim Walters and Todd Halvorson.. one of the best I've seen.