Feeds

Move space junk with laser shots

A little 'light' nudge

5 things you didn’t know about cloud backup

More than a decade's work could be closer to payoff for Canberra company EOS Space Systems, which last week told the Sixth European Conference on Space Debris that its laser systems could help move space junk out of the “danger zone”.

Before you start imagining orbiting satellites bristling with enough weaponry to knock out satellites, think again: the EOS Space Systems work has focussed on ground-based lasers whose energy (by the time it reaches the satellite) is merely enough to push the space junk away from dangerous orbits.

As the company's CEO Professor Craig Smith told The Register, moving stuff in space doesn't need all that much energy at all: “To move an object 100 meters over a 24 hour period we need to apply an amount of energy equal to about the solar radiation pressure (ie sunlight) for five to ten minutes.”

The Sun provides 0.16 watts per square centimetre (in space, not on Earth). That's the kind of energy EOS has to deliver at the piece of space junk, aimed in the direction you want to move the object. For that, EOS proposes starting with a 10kW laser.

That might sound like a surprisingly small laser for moving something in space – but to change something's orbit needs a lot less punch than to get a car moving on the ground. A lot less, as Professor Smith pointed out: “If we can change the object's velocity by one millimetre per second, then we can move it [That is, change its orbit – Ed] 100 meters in 24 hours.”

That, he said, is sufficient to move the object out of the “uncertainty zone” in which it has the potential to collide with active satellites.

With the physics of “solar pressure” well understood, the key challenge that EOS Space Systems has worked on for more than a decade (with an interruption after the 2002 Canberra bushfires which destroyed its first ranging station) is ranging and tracking the space junk that needs moving.

In collaboration with NASA, and with some Australian government funding, EOS created a demonstration system called RazorView which it says has tracked nearly 100 debris objects, some less than 10 centimetres in size, accurately enough that a metre-wide laser beam will impart enough energy to the target for it to move.

EOS Facility at Mt Stromolo

The EOS Space Research Centre at Mount Stromolo

The company has also created the adaptive optics that keep the laser beam on target and minimise divergence that might otherwise be caused by atmospheric turbulence.

Professor Smith told the space conference EOS Space Systems is not considering its proposal as a replacement for de-orbiting or capturing space junk. However, the capture programs are at best many years and billions of dollars away, if they happen at all. ®

Boost IT visibility and business value

More from The Register

next story
Our LOHAN spaceplane ballocket Kickstarter climbs through £8000
Through 25 per cent but more is needed: Get your UNIQUE rewards!
Cutting cancer rates: Data, models and a happy ending?
How surgery might be making cancer prognoses worse
Boffins ID freakish spine-smothered prehistoric critter: The CLAW gave it away
Bizarre-looking creature actually related to velvet worms
CRR-CRRRK, beep, beep: Mars space truck backs out of slippery sand trap
Curiosity finds new drilling target after course correction
SpaceX prototype rocket EXPLODES over Texas. 'Tricky' biz, says Elon Musk
No injuries or near injuries. Flight stayed in designated area
Brit balloon bod Bodnar overflies North Pole
B-64 amateur ultralight payload approaching second circumnavigation
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Scale data protection with your virtual environment
To scale at the rate of virtualization growth, data protection solutions need to adopt new capabilities and simplify current features.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?