Wednesday, April 28, 2010
APRIL 26TH, 2010 BY JIM GARRETTSON
The X-37B during launch preparations
Last week, Air Force Space Command launched Boeing’s X-37B unmanned space vehicle (USV) from an Atlas V rocket in Cape Canaveral. That much was made public. What wasn’t made public was what the spacecraft would be used for or when it’s coming back to Earth (although it can stay in space for at least 9 months at a time).
However, since there are no secrets in space (amateurs all over the world track pretty much everything shot into space and NORAD can track objects in space 4 inches across), DoD has dropped a few clues for some possible uses for the USV, starting with the Air Force press release issued the day of its launch. Col. André Lovett, the 45th Space Wing vice commander and the launch’s commander said, ”this launch helps ensure that our warfighters will be provided the capabilities they need in the future.”
The phrasing he used – ensuring that our warfighters will be provided the capabilities they need – echoes a recommendation of the Joint Operating Environment Report released last month. Because America’s 21st-century rivals see themselves as military competitors in space, the U.S. has to anticipate attacks to neutralize mission-critical technologies like GPS and the upgraded WideBand SATCOM satellites that make up the backbone of our armed forces’ command and control networks. The JOE report advocates avoiding complete dependence on a networked environment, an easily-exploitable “Achilles’ heel” in military capabilities that could be defended with, for example, an unmanned defense craft that can stay in orbit for nine months at a time.
The Defense Department has been worried about a “Space Pearl Harbor” at least since 2001, and in 2007, China shocked the world by shooting down a weather satellite. That the U.S., Russia and China possess ground-based anti-satellite (ASAT) capabilities isn’t in dispute, so adding a space-based anti-ASAT defense mechanism isn’t all that far-fetched. Also, since Boeing recently tested a solid-state laser designed to disrupt or disable a boosting ballistic missile, the technology currently exists to build such a platform.
The Air Force release says that new technologies on board the X-37B will “will make our access to space more responsive, perhaps cheaper, and push us in the vector toward being able to react to warfighter needs more quickly” if they prove successful, according to Gary Payton, Air Force deputy undersecretary for space programs. From that statement, it sounds like the Air Force is testing at least one Prompt Global Strike (PGS) capability.
Last week, the White House confirmed that it was considering adopting a hypersonic missile like the X-51 (also built by Boeing) that is capable of striking a target anywhere in the world in less than an hour. Prompt and precise strikes are a priority of Admiral Mike Mullen, who notes “Each time we kill a civilian inadvertently, we not only wreak devastation on the lives of their loved ones, we set our own strategy back months if not years. We make it hard for people to trust us.”
Even if the Air Force only plans to use the X-37B instead of the Space Shuttle to repair satellites in orbit, the program represents a major investment in America’s space capabilities, and programs like it might forestall our “slide to mediocrity.”
Posted by Steve Douglass at 7:35 AM
Livermore, California (CNN) -- Scientists at a government lab here are trying to use the world's largest laser -- it's the size of three football fields -- to set off a nuclear reaction so intense that it will make a star bloom on the surface of the Earth.
The Lawrence Livermore National Laboratory's formula for cooking up a sun on the ground may sound like it's stolen from the plot of an "Austin Powers" movie. But it's no Hollywood fantasy: The ambitious experiment will be tried for real, and for the first time, late this summer.
If they're successful, the scientists hope to solve the global energy crisis by harnessing the energy
generated by the mini-star.
The lab's venture has doubters, to be sure. Nuclear fusion, the type of high-energy reaction the California researchers hope to produce, has been a scientific pipe dream for at least a half-century. It's been pitched as a miracle power source. But it hasn't yielded many results.
To make matters worse, the U.S. Government Accountability Office this month released an audit of the lab's work that cites delays and mismanagement as reasons it's unlikely the scientists will create a fusion reaction this year.
But researchers in Livermore, about an hour's drive east of San Francisco, say it's not a matter of if but when their laser-saves-the-Earth experiment will be proved successful.
"We have a very high confidence that we will be able to ignite the target within the next two years," thus proving that controlled fusion is possible, said Bruno Van Wonterghem, a manager of the project, which is called the National Ignition Facility.
That would put the lab a step closer to "our big dream," he said, which is "to solve the energy problems of the world."
How to build a star
Here is the boiled-down recipe for how the Livermore lab plans to cook up a star:
Step one: Build the largest laser in the world, preferably inside a drab-looking office building. (To do this, you'll have to suspend all previous notions about what a laser looks like. This one is basically a giant factory full of tubes. The laser beam, which is concentrated light, bounces back and forth over the distance of a mile, charging up as it goes.)
Step two: Split this humongous laser into 192 beams. Aim all of them -- firing-range style -- at a single point that's about the size of a BB.
Step three: On that tiny target, apply a smidge of deuterium and tritium, two reactive isotopes of hydrogen that can be extracted from seawater. Surround those atoms with a gold capsule that's smaller than a thimble.
Step four: Fire the laser!
If all goes well, the resulting reaction will be hotter than the center of the sun (more than 100 million degrees Celsius) and will exert more pressure than 100 billion atmospheres. This will smash the hydrogen isotopes together with so much force and heat that their nuclei will fuse, sending off energy and neutrons.
Voila. An itty-bitty star is born.
Posted by Steve Douglass at 6:28 AM