Swiss scientists to build 'janitor satellite' to mop up space junk
A team of scientists in Lausanne, Switzerland, have announced a plan to build a satellite that would clear Earth's orbit of space debris.
EPFL/Swiss Space Center/AP
Earth is surrounded by a cloud of more than half a million pieces of space junk, from bus-size spent rocket stages to tiny flecks of paint. Orbiting at breakneck speeds, every last bit poses grave dangers — and means huge insurance premiums — for operational satellites, and it threatens the International Space Station, too. Every time two orbiting objects collide, they break up into thousands more pieces of debris.
To combat this growing headache, Swiss scientists and engineers have announced the launch of CleanSpace One, a project to build the first in a family of “janitor” satellites that will help clean up space.
To be launched as soon as three to five years from now, CleanSpace One will rendezvous with one of two defunct objects in orbit, either the Swisscube picosatellite, or its cousin TIsat, both 1,000 cubic centimeters (61 cubic inches) in size. When the janitor satellite reaches its target, it will extend a grappling arm, grab it and then plunge into Earth’s atmosphere, burning up itself and the space junk during re-entry.
CleanSpace One is being designed and built at the Swiss Space Center, part of the Swiss Federal Institute for Technology in Lausanne, or EPFL. Scientists there are developing the micro- and electric propulsion systems that will enable CleanSpace One to grab hold of space junk as the two objects zip around Earth at 17,500 mph (28,000 kph).
“The [main] challenge will be having a deployment either of a robotic arm or a deployment of a mechanism that will embrace or grab exactly Swisscube,” EPFL scientist Muriel Richard said in a press video. The design team is drawing inspiration from the grabbing mechanisms of living organisms, she said.