The amount of junk floating in space is getting out of hand
and the United States must step up its effort to control orbital trash, experts
are saying.
The chief of U.S. Strategic
Command said Wednesday that America needs better tools to monitor the orbital
debris that's up there and plan to avoid collisions with valuable
satellites.
"We are decades behind where
we should be, in my view," said Air Force Gen. Kevin P. Chilton in a
speech at Offutt Air Force Base, Neb. Chilton called for more personnel
and more sensors and equipment to study and combat the threat.
There are about 800 satellites in
orbit now, and more than 20,000 pieces
of debris in total, including bits of dead satellites and spent rockets, as
well as more eccentric items like loose gloves and tools that slipped away from
astronauts on spacewalks. And it's only likely to get worse as more satellites
are launched into the increasingly crowded orbital corridors of space.
"Space situational awareness
is no different than the situational awareness that we demand in any other
domain," Chilton said. "And we do not provide that in an adequate
fashion to my component commander in charge of space operations for the United
States of America."
Just today NASA announced that astronauts onboard the
station may have to board their Russian Soyuz spacecraft lifeboats Friday
evening as a safety precaution in case they must evacuate because of a space
junk impact. A small piece of debris appears poised to fly within 1,640 feet
(500 meters) of the orbiting laboratory Friday night at 10:48 EST (0348
Saturday GMT).
Though an actual impact is unlikely, the agency says,
astronauts must be prepared when any debris comes too close for comfort.
Crowded skies
Scientists agree. A recent study calculated that "close
encounters" between satellites and debris in orbit will rise by 50 percent
in the next 10 years, and by 250 percent by 2059, to more than 50,000 a week,
according to Reuters.
"The time to act is now, before the situation gets too
difficult to control," study leader Hugh Lewis of the University of
Southampton told Reuters. "The number of objects in orbit is going to go
up, and there will be impacts from that."
The seriousness of the situation was made apparent earlier
this year when two communications satellites accidentally slammed into each
other, creating two huge new clouds of shrapnel floating in orbit. China also
created a good chunk of debris in 2007 when it purposefully destroyed one of
its orbiting satellites in an anti-satellite test.
Rising costs
Indeed, many satellite operators are noticing the problem. The
commercial imaging satellite company GeoEye has had to maneuver some of its
spacecraft several times to avoid colliding with space junk, according to
SPACE.com partner Space News. The company was forced to move its 10-year-old
Ikonos satellite seven
times to evade debris.
These maneuvers are time-consuming and costly, requiring
extra fuel and expert personnel to plot a safe course through space. And using
up a satellite's precious fuel resources to avoid collisions shortens its useful
lifespan.
Space junk is also a critical concern for human space
exploration, where not just money but lives are on the line. NASA scrupulously
monitors the field for any objects that might pose a risk to the International
Space Station and shuttle crews.
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