Thriving Space Industry Raises Safety Issues for Low-Earth Orbit

NBC News looks at the "thriving ecosystem" of space businesses "dramatically expanding access to the cosmos and fueling what is projected to grow into a trillion-dollar commercial space industry." "Yet alongside the numerous benefits to society, increasing access to space and supporting an economy in orbit comes with its share of challenges, including how to balance a growing industry with the safe and sustainable use of outer space...." Speckled among the operational satellites in low-Earth orbit are thousands of tons of space debris, ranging from tiny flecks of paint to spent rocket parts to huge defunct spacecraft that have languished in orbital graveyards for decades. Adding more satellites to the mix not only increases the chances of a catastrophic on-orbit collision, but also pushes humanity closer to a perilous tipping point, beyond which certain parts of low-Earth orbit may become too cluttered and risky to operate in safely. "We're really on borrowed time before we have another big collision," said Charity Weeden, vice president of global space policy and government relations at Astroscale U.S., a private company that specializes in satellite servicing and orbital debris removal. "There are thousands of close calls every day in orbit...." But placing all the blame on these megaconstellations is oversimplifying the problem, said Darren McKnight, a senior technical fellow at LeoLabs, a California-based aerospace company that operates networks of ground-based radars and tracking systems to monitor objects in low-Earth orbit and map their movements. For one, operational satellites make up only a small fraction of the total number of objects in low-Earth orbit that pose collision risks, he said. And unlike defunct spacecraft that have languished in orbit for decades, most newer satellites can be maneuvered out of harm's way, if necessary. It has also become standard practice for satellite operators to have an end-of-life plan to cut down on the accumulation of space junk. These strategies include purposefully commanding a spacecraft to "deorbit," or burn up harmlessly in Earth's atmosphere, or strand it in a higher, "graveyard" orbit away from the most congested sections around the planet. Still, the risks are serious. And the amount of debris in space is expected to grow as launches continue. McKnight said "bad neighborhoods" have already emerged — areas in low-Earth orbit where big clouds of debris pose very real threats." There are certain places in Earth orbit where we are destined to have a major event within the next five to 10 years," he said. "We're looking at a 10 to 15 percent probability of a collision, which sounds unlikely, but by leaving these objects in orbit since the mid-'80s, we're rolling the dice a lot" These risks were amplified by a series of recent anti-satellite missile tests — one conducted by China in 2007, one by India in 2019 and one carried out by Russia last year — and a separate accidental collision between two satellites in 2009. Each event is estimated to have produced thousands of pieces of debris larger than the size of a golf ball, and even smaller, harder-to-track objects, according to the Secure World Foundation, a nongovernmental organization that focuses on space policy... Part of the problem is that while launches are subject to domestic regulations in individual countries, there is no international body to oversee what happens in orbit. Policies have yet to catch up with the industry's growth, and it's unclear if any binding global agreements can be achieved anytime soon. "It's like we're building the plane as we're flying it," said Josef Koller, a systems director for the Center for Space Policy and Strategy at The Aerospace Corp. The article also points out that companies like Astroscale are currently "developing technologies to actively remove objects from orbit."

Read more of this story at Slashdot.

from Slashdot https://ift.tt/P18Daok

Share on FacebookPlus on Google+

SUBSCRIBE TO OUR NEWSLETTER