| Apr 07, 2015
Are we alone in space? How were black holes formed? What is dark energy?
One of the biggest and most complex scientific experiments ever dreamed up - comparable in scale to the Large Hadron Collider - aims to find the answers to these and many more of the most challenging questions facing scientists.
And it’s already underway in the desert 800 kilometres north of Perth in Western Australia, in North-East Geraldton to be specific.
While its acronym, SKA, may sound cool, it’s a little less catchy when spelt out - Square Kilometre Array. Nevertheless, in scientific terms it will be as cool as it gets when it is completed. This radio telescope, made up of thousands of antennas in a collecting area of one square kilometre, is designed to capture images of deep space never seen before.
The telescope will be the world’s largest and most powerful, with its myriad of antennas - linked by high bandwidth optical fibre - capable of imaging objects in space … all the way back to the Big Bang.
It will be 50 times as sensitive as and 10,000 times faster than anything that exists at the moment. In terms of educating us about space, dark energy, black holes, and extra-terrestrial life, there has never been anything like it.
The project, conceived in the 1990s and due for completion in 2023, has three precursor telescopes - two in Western Australia and one in South Africa. The two in WA - called the Murchison Widefield Array - have been operational for two years. The SKA will be about 100 times bigger than the MWA and will be built on the same site in the WA desert.
To do their job they need phenomenal computer power and very fast connections. That’s because radio waves produce digital data that have to be converted by computer into images. And for that, the MWA has a special relationship with the National Broadband Network.
“The NBN plays a central role in what we do,” says Professor Steven Tingay, director of the MWA.
Not only is our service over the NBN critical to carry the raw material that, after analysis, will take our knowledge of the universe to the next level, but it is also is at the forefront of the next big challenge for big businesses - crunching big data.
In two years the MWA project has produced a colossal four petabytes of data - that’s one million gigabytes or the equivalent of over 5,700 hours of full HD video, and 50 scientific papers.
“It’s a massive amount of data and we need to get that out of the middle of the desert to somewhere where we can process it in a timely fashion,” says Professor Tingay.
With at least 11 countries behind the project - Australia, New Zealand, Britain, China, South Africa, Sweden, Italy, Canada, India, Germany, and The Netherlands - there’s a great deal of data to share and analyse on the way to SKA’s target completion date.The CSIRO has built a dedicated fibre optic line to deliver data at a blistering speed from Murchison to Geraldton, some 300 kilometres to the south. But NBN Co took over from there, laying more than 400 kilometres of fibre optics to deliver the mass of data to the Pawsey Supercomputing Centre in Perth.
“Without the NBN we would not get our data out,” says Professor Tingay.
The antennae and “tiles” that make up the MWA are scattered over 1.5 kilometres under clear desert skies, peering into deep space and “seeing”, for the first time, astonishing events.
“The MWA is leading the way. It’s early days but we are fully operational and we’re starting to see things we’ve never seen before,” says Professor Tingay. “We’ve seen galaxies in the process of being born; we’ve seen galaxies in the process of dying, so we are seeing the full life cycle of galaxies for the first time.”
The MWA telescopes are also able to probe in great detail the immediate environment of Earth. Its radio signals produce huge amounts of data which is then converted by computer to images.
At the moment physics doesn’t have an understanding of what makes up 95 percent of the universe, says Professor Tingay. But SKA will aim to solve, among other things, the mysteries of dark energy and “the cradle of life”, including whether there’s extra-terrestrial intelligence out there.
So, even though it’s early days in this multi-billion-dollar global quest to crack some of the toughest nuts in science, does he think we will be able to answer the question of whether we are alone in the universe?
“Life can exist anywhere energy can be transferred,” he says. “There are billions upon billions of stars, and billions and billions of galaxies. It would be ridiculous to think we are the only self-replicating conscious life force.
“I suspect that life is probably pretty common in the universe.”
Did you know?
● SKA central computer will have the processing power of 100 million PCs
● It’s so sensitive it can detect airport radar on planets tens of light years away
● Data collected in a day would take nearly 2 million years to play back on an iPod
● SKA dishes will produce 10 times the world’s internet traffic
● SKA uses enough optical fibre to wrap twice around the Earth
● SKA radio telescope will be 10,000 times faster than any existing radio telescopes
● It will be 50 times as sensitive as the best existing radio telescopes
● It “sees” through gas, dust and clouds
● It will ‘see’ back to the Big Bang
● It can see thousands of galaxies in one image
ASKAP dishes (background right) will be located in Western Australia. The mid frequency aperture array stations (bottom left), SKA-mid dishes and precursor MeerKAT dishes (background left) will be located in South Africa, with some remote stations in other African partner countries. Credit: SKA Organisation
The quest to find the answers to dark energy. Credit - SKA Organisation/Swinburne Astronomy Productions