In the small hours of this morning NASA scientists announced that its Mars Reconnaissance Orbiter has found evidence of flowing water on the red planet. In an official statement, the US Space Agency said:
New findings from NASA’s Mars Reconnaissance Orbiter (MRO) provide the strongest evidence yet that liquid water flows intermittently on present-day Mars… Our quest on Mars has been to ‘follow the water,’ in our search for life in the universe, and now we have convincing science that validates what we’ve long suspected.
So what does it all mean? We caught up with our very own Dr Paulo de Souza, a collaborating scientist on NASA’s earlier Exploration Rover mission, which landed two large robots on the surface of Mars.
Here are five things you should know about today’s discovery.
There is water on Mars
Erm, didn’t you already tell us that? Well yes, but as Dr de Souza explains, there’s an important distinction to be made.
“The story of water on Mars started when the composition of a meteorite found in 1984 in Antarctica revealed two things: large traces of carbonates, which need water to form, and a composition very similar to rock samples taken from Mars back in the seventies. There was no doubt that it came from Mars,” he said. Later a number of structures that resembled fossilised bacteria were found in this meteorite, but this claim is still controversial.
Fast forward to March this year, NASA found evidence that about one fifth of the planet’s surface was once covered by an ocean. Curiosity rover also found evidence of water vapour in the atmosphere. But this discovery does not close the water cycle.
“So the notion of Mars having once had water is nothing new, but this is different- this time scientists have actually found deposits of water.”
We’re not alone in the Universe…probably not anyway
Take a moment to let that sink in. Life may exist in another part of our solar system, right now.
“There are three key elements for life: nutrients, energy and water. Mars is rich in nutrients, gets its energy from the sun and now it has water. If you have water, you have life,” said Dr de Souza.
But we’re probably not talking about little green men.
“Large, complex forms of life as we know it need large water deposits sustained for long periods of time to grow and evolve. Life on Mars, if exists, is more likely to be in the form of minute microbes.”
You could be living there one day
You’ve probably heard that old chestnut before. Just last month Buzz Aldrin announced he was combining with scientists to develop a ‘masterplan’ to colonise Mars by 2039, the 70th anniversary of the moon landing.
But the discovery of water on Mars is a potential game changer.
“Having water available makes the prospect of Mars sustaining human life all the more real,” said Dr de Souza.
But there are still major challenges to overcome.
“Mars is a very hostile environment. Its atmosphere is very thin and has only a tiny concentration of oxygen making it impossible to walk in the open air. It’s exposed to high levels of solar radiation, extreme temperatures and severe sandstorms with winds up to 400km/h,” Dr de Souza said.
And the water NASA has found is very salty.
“Imagine if you had a little bit of salt on a plate and threw some water on it, the water would then be salty. The surface of Mars is like a salty plate.”
You’re probably not as special as you thought you were this time yesterday
What is it with humans and our insatiable desire to diminish our own importance?
“500 years ago we thought we were at the centre of the Universe, with everything revolving around us,” said Dr de Souza. “Then scientists demonstrated that the earth revolved around the sun, and all of a sudden there was something more important than our planet.”
About 300 years later scientists discovered that our sun was just another star. And how many stars are there in the Universe?
“Go down to Bondi Beach, take a handful of sand and try to count how many grains there are. Then imagine trying to count the grains in a truck full of sand. Can you now try to imagine how many grains of sand there are on Bondi Beach? There are more stars in the Universe than grains of sand on planet earth.”
But still we desperately clung to our sense of importance, safe in the knowledge that we lived in the only solar system in the Universe…..until the discovery of planet HD 114762 b was discovered in 1989, followed by numerous other sun orbiting planets.
Now we’re facing the very real possibility of finding life outside of our planet. Tough time to be a human.
This is just the beginning
The discovery of water on Mars will help to shape future missions to the red planet.
“Perhaps the greatest thing about this discovery is that it provides a cornerstone for future missions, as we now know what to look for,” Dr de Souza said.
“We are still in the very early stages of space exploration; just learning to go out of our cave and start to explore. It’s a very exciting time to be a scientist.”
Our Canberra Deep Space Communication Complex has supported NASA’s Mars Reconnaissance Orbiter, relaying commands and receiving images and data from the orbiting spacecraft high above the red planet over the past decade. Want to know more about our space and astronomy work? Take a look at some of our cosmic highlights from earlier this year.
Income inequality is undoubtedly one of the most controversial economic issues of modern societies, with many countries facing incredible differences between those who make more and those who make less. But what is happening across Australian regions?
Although researchers such as Peter Whiteford and Nicholas Biddle have investigated the issue in Australia, there are no official records on income inequality measured consistently across regions of the country – even at national level income inequality measures are rarely available in international comparisons (see for instance, World Bank and OECD data.
This lack of evidence is a clear reflection that income inequality is less conflicted in Australia compared to other countries, as Australia is characterised as having very low rates of poverty and economic segregation, compared to other societies, and a culture of “a fair go”.
However, regardless of the apparent “economic equality” in our society, income inequality is still an important issue to track and analyse. In order to fill the gap on income inequality measures across the country, we have developed a method to approximate Gini coefficients for different Australian regions, including states and local councils.
What we found
At state level, based on our estimates in 2011, the most unequal jurisdiction was NSW (0.42), followed by the Northern Territory (0.40), while the least unequal was Tasmania (0.38), meaning that the gap between the rich and the poor was bigger in NSW than in Tasmania.
However, income distribution varies over time, with the ACT showing the biggest change in income inequality, where the Gini coefficient increased from 0.35 in 2001 to 0.39 in 2011.
At sub-state level, within metropolitan areas, we found that the local councils of Burwood, Strathfield, Kogarah and Sydney (all from the Sydney Metropolitan area) had the highest income inequality in the country in 2011, while the local councils of Melton (in Melbourne), Light (in Brisbane), Mallala (in Perth) and Palmerstone (in Darwin) had the lowest income inequality.
In terms of trends in cities, interestingly Perth captured both extremes: while the suburbs of Cottesloe and Subiaco is where income inequality has increased the most, the local council of Perth had the lowest increase in inequality across Australian cities.
Using the Gini co-efficient
The Gini is one of the most used indicators for income inequality across the world for its simplicity: a Gini of 0 means that the total income of the region is distributed evenly across all persons of the region, while a Gini of 1 means all income captured by just one person. According to the OECD, in 2012 Australia had a Gini of 0.326, while the US had a Gini of 0.390.
Thus, in order to provide more insights about the effects of the mining boom of the recent decade across Australian regions, we have constructed Gini coefficients for family income reported in the national censuses of 2001 and 2011, across all regions of the country (see our published paper here.
Although our measures are not perfect and are subject to some assumptions, including the assumption that 30% of families in the richest income bracket capture 70% of the income in that segment (see the assumptions used and estimation steps here), they do provide a good sign of how income inequality varies across the country and how it has been changing over time.
All Gini coefficients across regions are available here.
These income inequality data raise several questions. Are the reasons for income inequality different around the country? Does income inequality affect other factors such as health, as evidenced in the US?
What levels of income inequality are acceptable across Australian regions? And what actions are required to address this? These are the questions policy makers should now tackle.
By Minky Faber
Have you ever been to a gallery or museum exhibition where only the front of a sculpture or ornament is visible in the display cabinet? Perhaps there is a dawdling family of six, gawking at the intricacies of the 2nd Century Roman bust. Maybe it’s a gaggle of slow moving art students analysing every crevice of a Greek vase.
Regardless, it can be a frustrating experience for the curious inquisitor. Firstly, getting a close-up vantage point amongst the crowd for an uninterrupted view, then that awkward moment when you peer in on such an angle that your head hits the glass.
What if you could explore the item with your fingertips from every angle in life-size scale? Wouldn’t it be something to view the inside of a crown of jewels or an extinct specimen from every point of view?
We’ve joined forces with the National Gallery of Australia (NGA) to create a new way for visitors to interact with the artefacts currently on show in the Myth + Magic: Art of the Sepik River, Papua New Guinea exhibition; showcasing the intricate sculptural art of the Sepik River region.
The art of the region uses many different materials including: timber, pig tusks, feathers, shells, bone, hair, teeth, fur, and clay. It is often because of the age, fragility, and pricelessness of these materials that we are required to stand behind red rope and glass to appreciate and explore the relics.
To overcome this issue our Data61 research team, in collaboration with the National Biological Research Collections and the Atlas of Living Australia, developed a new 3D content deployment platform using open web standards to transform the physical exhibits into fully interactive digital sculptures.
Visitors can interact with the touch screen and view the artwork close-up, from the bottom or the back, and learn more about the intricate details and the culturally significant features: like symbols and materials.
Of course the digital version won’t replace seeing the real thing, but the additional information will complement and enhance the experience.
This technology isn’t entirely new. We have used 3D scanning capabilities to great affect with InsectScan, a way for researchers to easily capture digital 3D models of tiny insect specimens in full colour and high-definition. Building on this existing technology for the NGA’s Myth + Magic: Art of the Sepik River, Papua New Guinea exhibit is one way we are improving and tailoring our work for other organisations and institutions.
The NGA is just the most recent example of our work with the Galleries, Libraries, Archives and Museums (GLAM) sector, and we have been working with a number of organisations to embrace digital innovation.
Science is often the inspiration for art, from van Gogh’s Starry Night to the physiological sketches of da Vinci’s Vitruvian Man, so we’re excited to continue that tradition and build on this symbiosis of disciplines and extend the understanding of art in microscopic detail through advances in digitisation technology.
So, if you’re in Canberra before 1 November, make sure you head down to the NGA to check out the Myth + Magic: Art of the Sepik River, Papua New Guinea exhibition and let us know what you think of the real and digital artworks in the comments below.
Neutron stars – the dead stellar remnants of old, burned-out stars – are some of the most extreme objects in the universe. They weigh as much as the entire Sun, but are small enough to fit into Sydney’s CBD, and they rotate up to 700 times every second. Imagine that: a whole star rotating faster than the fastest kitchen blender.
Astronomers know of a few thousand neutron stars, but one in particular is a stand-out. As part of the Parkes Pulsar Timing Array, we have been observing pulsar J1909-3744 with the CSIRO’s Parkes Radio Telescope for 11 years.
During this time, we have accounted for every single one of the neutron star’s 116 billion rotations (115,836,854,515, to be precise). We know the rotational period of this star to 15 decimal places, making it truly one of the most accurate clocks in the universe.
But, as we show in a paper published today in the journal Science, it was not supposed to be this way. Gravitational waves from all of the black holes in the universe were supposed to ruin the timing precision of this pulsar. But they have not.
Gravitational waves stretch and squeeze space, causing the distance between us and the neutron star to change. The gravitational waves we were looking for should have altered that distance by about ten metres, a tiny fraction given that this neutron star is about 3.6 x 1019 metres from Earth (that’s 3.6 with 19 zeros following)! But this should have been enough to show up in our measurements.
Yet the fact that our measurements are so accurate tells us that something is wrong with the theory. This doesn’t mean that gravitational waves don’t exist. There are other facets of our understanding of the universe that might be off track.
Whatever the resolution to this quandary, it is sure to change the way we understand the most massive black holes in the universe.
The centre of our galaxy harbours a black hole that weighs more than four million times the mass of our sun. But this is a lightweight; other galaxies contain black holes weighing more than 17 billion times the mass of our Sun.
And we have good reason to believe that most, if not all, galaxies contain supermassive black holes in their cores. We also know that galaxies throughout the universe grow by merging with one another.
Following the merger of any two galaxies, the two black holes from the parent galaxies sink to the centre of the daughter galaxy, forming a supermassive black hole binary pair. At some point, the subsequent evolution of the binary pair becomes dominated by the emission of gravitational waves.
Ripples in spacetime
When any two black holes are spiralling around one another, they ought to emit gravitational waves. These carry energy away from the system, causing the two black holes to move closer together.
The sum of all the binary supermassive black holes in the universe should produce a background of gravitational waves (similar to the cosmic microwave background). It is this background that was expected to ruin our precision timing of PSR J1909-3744.
Astrophysicists have made a number of predictions about the strength of the background. These predictions incorporate state-of-the-art measurements of galaxy formation and evolution, and the most sophisticated theoretical models of how the universe evolves following the Big Bang.
Why no gravitational waves?
But we want to be very clear that our lack of a detection does not imply that Einstein’s theory of relativity is wrong, nor does it imply that gravitational waves don’t exist. While we don’t know the real solution, we have a number of ideas.
Perhaps not every galaxy in the universe contains a supermassive black hole. Reducing the fraction of galaxies that host supermassive black holes in the models reduces the predicted amplitude of the gravitational wave background, potentially making it undetectable by our observations.
Perhaps we do not understand the relationship between the mass of the host galaxy and the mass of the black hole. We use empirical relationships between galaxy and black hole masses to determine the latter. While we believe these are robust in the local universe, the black hole mergers we are most sensitive to occur billions of light years from us, where our understanding of these empirical relations is far from complete.
Perhaps one of our assumptions about the process that drives the mergers is too simplistic. For example, if the centres of galaxies contain significant amounts of gas, it can act like an extra friction force, causing black holes to merge with one another quicker than expected. This would also cause a smaller-than-expected amplitude of the gravitational wave background.
At the moment, each of these scenarios is equally plausible. Continued observations of pulsars, as well as observations of the distant universe with large optical telescopes, may soon allow us to distinguish between these ideas. And, one day, we may finally find the direct evidence for the existence of gravitational waves that we’re looking for.
By Emily Lehmann
In a mission to bolster the nation’s air force fleet, the Australian Government has committed to bring home 72 stealthy, next-gen F-35 Joint Strike Fighters (JSF). It’s Australia’s largest military acquisition and will be part of a more than 3000-strong global fleet of JSFs – and every one of these strike fighters will have Australian made components inside.
Increasing production rates to deliver these aerospace parts is critical. That’s why the Australian Government’s New Air Combat Capability program tasked us with developing a technology to drive greater efficiency for the local manufacturers who make and supply them.
The result? A metal machining (cutting) technology that is five times faster and which dramatically reduces machining costs by as much as 80 per cent.
Crucial titanium alloy parts make up about 15 per cent of an aircraft, and are ideal for their lightweight, yet super strong qualities. But from a machining point of view, titanium alloys are notoriously difficult and complicated to work with. The conventional methods out there are slow and tools tend to break prematurely.
Our technology, called thermally assisted machining (TAM) works by pointing a laser beam on the workpiece ahead of the cutting tool, heating up the metal so that it’s more pliable. This speeds up the process while preventing damage and wear to machining tools.
With metal aerospace components estimated to be worth a sizey $50 billion worldwide (and growing) this technology could see Australian manufacturers further tap into the global market for military and commercial aircraft.
TAM’s applications go beyond the titanium machining too, and could benefit other nickel and iron base super alloys which are difficult to machine.
We’re now partnering with local manufacturer H&H Tools to develop a prototype for a gantry type milling machine to demonstrate how the technology works. We expect this to be ready in 2016.
Find out more about our technologies for high performance metals.
By Fiona McFarlane
Who would have guessed that our own backyards might be a battlefield for bees?
And that these deadly skirmishes involve aerial battles lasting days, with hundreds of fatalities from both attacking and defending sides, ousting the helpless from the hive and culminating in the eventual overthrow of the resident queen and installing their own in her place.
A cluster of dead native bees on the ground in a Brisbane backyard was enough to convince a group of scientists to dig deeper into this unusual behaviour of the Australian native bee species, Tetragonula carbonaria.
Their further investigations led to a surprising discovery, that the study colony was not only being attacked by its own species but also by a closely related species, T. hockingsi.
A fight to the death
Prior to this study, only the one species of bee, T. carbonaria was known to engage in battles between neighbouring colonies involving mass fatalities but this study provides the first evidence of fatal fighting between different species.
Fighting to the death or ‘fatal fighting’ is relatively rare in nature. Evolutionary biologists propose that this is because species have evolved different ways to assess strength and fighting ability that doesn’t involve the loss of the individual.
In species where fighting does escalate to death, scientific theory predicts the risk of death is outweighed by the benefits being obtained, such as fighting for scarce food resources, mates or nest sites.
Fatal fighting has been well studied in ants with beneficial outcomes including slave-making, raiding of nest supplies and gaining access to new food sites.
In the case of the T. carbonaria, the researchers hypothesised that the fighting swarms were most likely attempts at taking over neighbouring hives.
To test their hypothesis, they made regular observations on the ‘study’ hive in the backyard and collected the dead bees after fights for analysis. Using modern molecular techniques they were able to track which group of bees were attacking and which were defending. It was this analysis that lead to the surprising discovery that the attacking bees were in fact a separate species.
Following a succession of attacks by the same T. hockingsi colony over a four-month period, the defending T. carbonaria colony was defeated and the hive usurped, with the winning colony installing a new queen.
To ensure that what had occurred at the study hive was not a one-off event, our researchers monitored the colonies of over 260 commercial T. carbonaria hives over a five-year period, recording any changes in species through changes in hive architecture (see note).
They found evidence of 46 interspecies hive changes (via the change in hive architecture) during the five year period, which were most likely to be usurpation events.
There is still much to be learnt about these small creatures, such as what instigates the attacks how and when the invading queen enters the nest, and whether the young in the usurped hive are spared and reared as slaves, or killed outright.
In the case of our native bees, it is thought that the capture of a fully provisioned nest (including ‘propolis’, pollen and honey stores) is a sufficiently large benefit that it outweighs the loss of so many lives.
Let’s ‘bee’ clear, we still need further research
The researchers are quick to point out that this is an excellent example of how little we actually know about small stingless bees, which can be an excellent and resilient alternative pollinators to declining honey bee populations.
NOTE: T. carbonaria has a brood chamber, in which cells are even and connected by their walls to adjacent cells at the same height, whereas T. hockingsi brood chamber takes on a less organised appearance, being an irregular lattice comprised of clumps of around ten cells connected by vertical pillars.
A Spanish cancer patient has received a 3D printed titanium sternum and rib cage designed and manufactured right here in Australia, at our Melbourne-based 3D printing facility in Melbourne.
Suffering from a chest wall sarcoma (a type of cancerous tumour that grows, in this instance, around the rib cage), the 54 year old man needed his sternum and a portion of his rib cage replaced. This part of the chest is notoriously tricky to recreate with prosthetics, due to the complex geometry and design required for each patient. So the patient’s surgical team determined that a fully customisable 3D printed sternum and rib cage was the best option.
That’s when they turned to Melbourne-based medical device company Anatomics, who designed and manufactured the implant utilising our 3D printing facility, Lab 22.
The news was announced by Industry and Science Minister Ian Macfarlane today. And the news is good, 12 days after the surgery the patient was discharged and has recovered well.
This isn’t the first time surgeons have turned the human body into a titanium masterpiece. Thoracic surgeons typically use flat and plate implants for the chest. However, these can come loose over time and increase the risk of complications. The patient’s surgical team at the Salamanca University Hospital thought a fully customised 3D printed implant could replicate the intricate structures of the sternum and ribs, providing a safer option for the patient.
Using high resolution CT data, the Anatomics team was able to create a 3D reconstruction of the chest wall and tumour, allowing the surgeons to plan and accurately define resection margins. We were then called on to print the sternum and rib cage at Lab 22.
As you could imagine, the 3D printer at Officeworks wasn’t quite up to this challenge. Instead, we relied on our $1.3 million Arcam printer to build up the implant layer-by-layer with its electron beam, resulting in a brand new implant which was promptly couriered to Spain.
This video explains how it all works.
The advantage of 3D printing is its rapid prototyping. When you’re waiting for life-saving surgery this is the definitely the order of the day.
We are no strangers to biomedical applications of 3D printing: in the past we have used our know-how to create devices like the 3D printed heel-bone, or the 3D printed mouth-guard for sleep apnoea suffers.
When it comes to using 3D printing for biomedical applications, it seems that we are just scratching the surface of what’s possible. So, we’re keen to partner with biomedical manufacturers to see how we can help solve more unique medical challenges.
Media contact: Crystal Ladiges, Phone: +61 3 9545 2982, Mobile: +61 477 336 854 or Email: Crystal.Ladiges@csiro.au