This headline seems a little misleading. When I first saw it, I thought that it meant that the Air Force had given up on orbital refueling, but all it means is that the experiment was largely successful, and is over.

This headline seems a little misleading. When I first saw it, I thought that it meant that the Air Force had given up on orbital refueling, but all it means is that the experiment was largely successful, and is over.

This headline seems a little misleading. When I first saw it, I thought that it meant that the Air Force had given up on orbital refueling, but all it means is that the experiment was largely successful, and is over.

General Chilton is taking over as head of STRATCOM. I’m pretty sure that this will be the first time an astronaut has held that post:

After flying operational and weapon-testing missions in F-4 and F-15 fighter jets, Chilton moved into the space track, joining NASA in 1987. As a part of the world

It’s interesting how much you can figure out about a classified satellite from ground observations. And these are amateurs. Governments can do a lot better (though with some of the new telescopes available to amateurs, the distinction is getting blurred).

It’s interesting how much you can figure out about a classified satellite from ground observations. And these are amateurs. Governments can do a lot better (though with some of the new telescopes available to amateurs, the distinction is getting blurred).

It’s interesting how much you can figure out about a classified satellite from ground observations. And these are amateurs. Governments can do a lot better (though with some of the new telescopes available to amateurs, the distinction is getting blurred).

I’m going to be on The Space Show this evening, along with my webmaster, Bill Simon, talking about the July 20th ceremony, and other space-related topics. It starts at 7 PM Pacific, 10 Eastern, for an hour on the radio, and some additional time streaming, until 8:30 Pacific.

Ferris Valyn has the latest edition of his space diary up, with a lot of links, and discussion of the conference. Also, yesterday, I failed to mention the latest edition of the Carnival of Space over at Music of the Spheres.

I look at using chemical vapor deposition (and welding) to build a mono-crystalline, mono-molecular carbon space elevator over at The Space Review. Surprisingly, it will cost about what Brad Edwards budgeted for single-walled carbon nanutube (CNT) manufacturing.

If space elevators cost $25,000/kg and space delivery after the elevator’s up cost $10-$800/kg, then the second space elevator probably should be built out of less expensive, less exotic materials. If Kevlar is only 2% as strong as carbon nanotubes, you can still afford 50 kg of Kevlar for the price of 1 kg of diamonds at delivery costs and purchase prices less than $500 if elevator-quality CNT cost at least as much as bulk purchases of pure synthetic diamonds wholesale. One wouldn’t use Kevlar further down the elevator because then there would be a multiplier because we would need more Kevlar to hold the Kevlar and it would go up by a factor of e⁵⁰ or so. But that doesn’t apply right at the base–it’s pretty much linear there.

Another issue I may explore is that if a Mars elevator can be 6 tons or less, it might weigh less than the fuel needed to take off from Mars or even the fuel and aerobrake to get from Mars geosynchronous orbit to the surface. Mars exploration economics change a lot if return oxygen can be carted up from the surface by elevator. Note that one would not necessarily need laser or microwave power to power a climber on Mars. Solar power for a climber would have it climb slower, but it would still climb.

A great place to work the kinks out of space elevator technology is the Moon. A Lunar space elevator going from a little ways Earthward of Earth-Moon L-1, would not need materials as strong as a space elevator for the Earth’s surface. If successful, it would allow much more mass to go down to the surface and much more return mass than the 46 metric tons of LSAM ascender and descender. A 7-ton Lunar elevator and some climbers powered from Earth would provide as much cargo capacity as Edwards’s starter elevator on Earth. Since Lunar exploration doesn’t really begin in earnest until late next decade according to the current (perhaps overly optimistic) vision, it might be worth doing some thought experiments about saving mass on the very first sortie to the Moon by using a Lunar space elevator. Pearson advocated this using M5 fiber to make a 7,000 kg Lunar elevator with 200 kg capacity a few years back. Forget thought experiments, launch the @$%#! elevator.