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VIDEO: Christopher Nolan on Interstellar science

Astronomy News - 23 June 2015 - 9:41am

Director Christopher Nolan talks about the importance of accurate science in making his film Interstellar, after a leading scientific journal calls for it to be shown in school lessons.

Masters of the universe

Astronomy News - 22 June 2015 - 10:19am

Imagine having to design a completely automated system that could take all of the live video from all of the hundreds of thousands of cameras monitoring London, and automatically dispatch an ambulance any time any person falls and hurts themselves, anywhere in the city, without any human intervention whatsoever. That is the scale of the problem facing the team designing the software and computing behind the world’s largest radio telescope.

When it becomes operational in 2023, the Square Kilometre Array (SKA) will probe the origins, evolution and expansion of our universe; test one of the world’s most famous scientific theories; and perhaps even answer the greatest mystery of all — are we alone?

Construction on the massive international project, which involves and is funded by 11 different countries and 100 organisations, will start in 2018. When complete, it will be able to map the sky in unprecedented detail — 10,000 times faster and 50 times more sensitively than any existing radio telescope — and detect extremely weak extraterrestrial signals, greatly expanding our ability to search for planets capable of supporting life.

The SKA will be co-located in South Africa and Australia, where radio interference is least and views of our galaxy are best. The instrument itself will be made up of thousands of dishes that can operate as one gigantic telescope or multiple smaller telescopes — a phenomenon known as astronomical interferometery, which was developed in Cambridge by Sir Martin Ryle almost 70 years ago.

“The SKA is one of the major big data challenges in science,” explains Professor Paul Alexander, who leads the Science Data Processor (SDP) consortium, which is responsible for designing all of the software and computing for the telescope. In 2013, the University’s High Performance Computing Service unveiled ‘Wilkes’ — one of the world’s greenest supercomputers with the computing power of 4,000 desktop machines running at once, and a key test-bed for the development of the SKA computing platform.

During its projected 50-year lifespan, the SKA will carry out several experiments to study the nature of the universe. Cambridge researchers will focus on two of these, the first of which will follow hydrogen through billions of years of cosmic time.

“Hydrogen is the raw material from which everything in the universe developed,” says Alexander. “Everything we can see in the universe and everything that we’re made from started out in the form of hydrogen and a small amount of helium. What we want to do is to figure out how that happened.”

The second of the two experiments will look at pulsars — spinning neutron stars that emit short, quick pulses of radiation. Since the radiation is emitted at regular intervals, pulsars also turn out to be extremely accurate natural clocks, and can be used to test our understanding of space, time and gravity, as proposed by Einstein in his general theory of relativity.

By tracking a pulsar as it orbits a black hole, the telescope will be able to examine general relativity to its absolute limits. As the pulsar moves around the black hole, the SKA will follow how the clock behaves in the very strong gravitational field.

“General relativity tells us that massive objects like black holes warp the space–time around them, and what we call gravity is the effect of that warp,” says Alexander. “This experiment will enable us to test our theory of gravity with much greater precision than ever before, and perhaps even show that our current theories need to be changed.”

Although the SKA experiments will tell us much more than we currently know about the nature of the universe, they also present a massive computing challenge. At any one time, the amount of data gathered from the telescope will be equivalent to five times the global internet traffic, and the SKA’s software must process that vast stream of data quickly enough to keep up with what the telescope is doing.

Moreover, the software also needs to grow and adapt along with the project. The first phase of the SKA will be just 10% of the telescope’s total area. Each time the number of dishes on the ground doubles, the computing load will be increased by more than the square of that, meaning that the computing power required for the completed telescope will be more than 100 times what is required for phase one.

“You can always solve a problem by throwing more and more money and computing power at it,” says Alexander. “We have to make it work sensibly as a single system that is completely automated and capable of learning over time what the best way of getting rid of bad data is. At the moment, scientists tend to look at data but we can’t do that with the SKA, because the volumes are just too large.”

The challenges faced by the SKA team echo those faced in many different fields, and so Alexander’s group is working closely with industrial partners such as Intel and NVIDIA, as well as with academic and funding partners including the Universities of Manchester and Oxford, and the Science and Technology Facilities Council. The big data solutions developed by the SKA partners to solve the challenges faced by a massive radio telescope can then be applied across a range of industries.

One of these challenges is how to process data efficiently and affordably, and convert it into images of the sky. The target for the first phase of the project is a 300 ‘petaflop’ computer that uses no more than eight megawatts of power: more than 10 times the performance of the world’s current fastest supercomputer, for the same amount of energy. ‘Flops’ (floating point operations per second) are a standard measure of computing performance, and one petaflop is equivalent to a million billion calculations per second.

“The investment in the software behind the SKA is as much as €50 million,” adds Alexander. “And if our system isn’t able to grow and adapt, we’d be throwing that investment away, which is the same problem as anyone in this area faces. We want the solutions we’re developing for understanding the most massive objects in the universe to be applied to any number of the big data challenges that society will face in the years to come.”

Inset images: Artist's impression of the SKA, which will be made up of thousands of dishes that operate as one gigantic telescope (SKA Organisation); Professor Paul Alexander (University of Cambridge).

The ‘world’s largest IT project’ — a system with the power of one hundred million home computers — may help to unravel many of the mysteries of our universe: how it began, how it developed and whether humanity is alone in the cosmos.

This experiment will enable us to test our theory of gravity with much greater precision than ever before, and perhaps even show that our current theories need to be changedPaul AlexanderSKA OrganisationArtist's impression of the SKA, which will be made up of thousands of dishes that operate as one gigantic telescope


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Lava lakes spotted on Venus may be how it stays so blemish-free

Astronomy News - 22 June 2015 - 10:17am

Our evil twin planet has a smooth face, implying its blemishes were masked by lava. Now we've finally seen evidence of the stuff bubbling up from a geological rift







Grand Theft Sedna: how the sun might have stolen a mini-planet

Astronomy News - 22 June 2015 - 10:16am

Sedna is one of several "ice dwarfs" in our solar system with bizarre orbits. Could the young sun's gravity have snatched them from a passing star?







Comet lander Philae renews contact

Astronomy News - 22 June 2015 - 10:07am

Europe's Philae comet lander has been back in touch with Earth - its first contact since Sunday.

Volcanic eruptions glimpsed on Venus

Astronomy News - 22 June 2015 - 10:07am

Scientists say they have the best evidence yet that there is hot lava spewing from the surface of Venus.

Dissolving Titan

Astronomy News - 19 June 2015 - 10:23am

Saturn's moon Titan is home to seas and lakes filled with liquid hydrocarbons, but what makes the depressions they lie in? A new study suggests that the moon's surface dissolves in a similar process that creates sinkholes on Earth.

Hot lava flows discovered on Venus

Astronomy News - 19 June 2015 - 10:22am

ESA's Venus Express has found the best evidence yet for active volcanism on Earth's neighbour planet.

Best Observational Evidence of First Generation Stars in the Universe

Astronomy News - 19 June 2015 - 10:17am
Astronomers using ESO’s Very Large Telescope have discovered by far the brightest galaxy yet found in the early Universe and found strong evidence that examples of the first generation of stars lurk within it. These massive, brilliant, and previously purely theoretical objects were the creators of the first heavy elements in history — the elements necessary to forge the stars around us today, the planets that orbit them, and life as we know it. The newly found galaxy, labelled CR7, is three times brighter than the brightest distant galaxy known up to now.

Hubble Sees the 'Teenage Years' of Quasars

Astronomy News - 19 June 2015 - 10:16am

Get larger image formats

Quasars are the light fantastic. They are the brightest beacons in the universe, blazing across space with the intrinsic brightness of one trillion suns. Yet the objects are not vast galaxies, but they appear as pinpoint sources in the biggest telescopes of today hence the term "quasar" for quasi-stellar object. Discovered in the 1960s, it took more than two decades of research to come to the conclusion that quasars are produced by the gusher of energy coming from over-fed supermassive black holes inside the cores of very distant galaxies. And, most quasars bloomed into a brief existence 12 billion years ago.

Just 3 days left to register for this year's National Astronomy Meeting at Venue...

Astronomy News - 19 June 2015 - 10:16am
Just 3 days left to register for this year's National Astronomy Meeting at Venue Cymru, Llandudno! Registration is open at http://nam2015.org/index.php/registration until 20th June.

Don't forget to book a seat at the conference dinner where comedian and astronomy enthusiast Jon Culshaw will be hosting the awards ceremony.

Also, book through registration for a free ticket to a public talk by Martin Rees, the Astronomer Royal, on the 7th July (http://nam2015.org/index.php/public-events/public-talk).


Registration
nam2015.org
National Astronomy Meeting 2015

Einstein kills Schrödinger's cat: Relativity ruins quantum world

Astronomy News - 19 June 2015 - 10:15am

The same quirk of general relativity that means your head ages faster than your feet may mean we have to go to space to see large-scale quantum mechanics in action







NASA plans first interplanetary CubeSat mission for Mars lander

Astronomy News - 19 June 2015 - 10:15am

CubeSats promise cheap, easy access to low-Earth orbit, but none has ever gone to deep space. That's about to change with a mission called Mars Cube One







Our dream scenario for Philae – and mission finale for Rosetta

Astronomy News - 19 June 2015 - 10:14am

Cinzia Fantinati of the European Space Agency explains how they will get Philae to do science, and how the Rosetta mothership will end its mission







Dual asteroid strike hints at chaos in the inner solar system

Astronomy News - 19 June 2015 - 10:14am

A pair of unrelated asteroids. That's not supposed to happen. What on earth skewed their orbits, and plunged us into ice age?







Chasing shadows: How long can we keep looking for dark matter?

Astronomy News - 19 June 2015 - 10:13am

We've known we need dark matter since the 1930s, but still haven't found it. The search can't go on forever







Revived Philae poised to do comet science

Astronomy News - 19 June 2015 - 10:01am

Revived Philae poised to do comet science

Nature 522, 7556 (2015). http://www.nature.com/doifinder/10.1038/522263a

Author: Elizabeth Gibney

Comet lander has enough power to do experiments but needs a better communications link.

The mass of the Mars-sized exoplanet Kepler-138 b from transit timing

Astronomy News - 19 June 2015 - 10:01am

The mass of the Mars-sized exoplanet Kepler-138 b from transit timing

Nature 522, 7556 (2015). doi:10.1038/nature14494

Authors: Daniel Jontof-Hutter, Jason F. Rowe, Jack J. Lissauer, Daniel C. Fabrycky & Eric B. Ford

Extrasolar planets that pass in front of their host star (transit) cause a temporary decrease in the apparent brightness of the star, providing a direct measure of the planet’s size and orbital period. In some systems with multiple transiting planets, the times of the transits are measurably affected by the gravitational interactions between neighbouring planets. In favourable cases, the departures from Keplerian orbits (that is, unaffected by gravitational effects) implied by the observed transit times permit the planetary masses to be measured, which is key to determining their bulk densities. Characterizing rocky planets is particularly difficult, because they are generally smaller and less massive than gaseous planets. Therefore, few exoplanets near the size of Earth have had their masses measured. Here we report the sizes and masses of three planets orbiting Kepler-138, a star much fainter and cooler than the Sun. We determine that the mass of the Mars-sized inner planet, Kepler-138 b, is Earth masses. Its density is grams per cubic centimetre. The middle and outer planets are both slightly larger than Earth. The middle planet’s density ( grams per cubic centimetre) is similar to that of Earth, and the outer planet is less than half as dense at grams per cubic centimetre, implying that it contains a greater portion of low-density components such as water and hydrogen.

A permanent, asymmetric dust cloud around the Moon

Astronomy News - 19 June 2015 - 10:01am

A permanent, asymmetric dust cloud around the Moon

Nature 522, 7556 (2015). doi:10.1038/nature14479

Authors: M. Horányi, J. R. Szalay, S. Kempf, J. Schmidt, E. Grün, R. Srama & Z. Sternovsky

Interplanetary dust particles hit the surfaces of airless bodies in the Solar System, generating charged and neutral gas clouds, as well as secondary ejecta dust particles. Gravitationally bound ejecta clouds that form dust exospheres were recognized by in situ dust instruments around the icy moons of Jupiter and Saturn, but have hitherto not been observed near bodies with refractory regolith surfaces. High-altitude Apollo 15 and 17 observations of a ‘horizon glow’ indicated a putative population of high-density small dust particles near the lunar terminators, although later orbital observations yielded upper limits on the abundance of such particles that were a factor of about 104 lower than that necessary to produce the Apollo results. Here we report observations of a permanent, asymmetric dust cloud around the Moon, caused by impacts of high-speed cometary dust particles on eccentric orbits, as opposed to particles of asteroidal origin following near-circular paths striking the Moon at lower speeds. The density of the lunar ejecta cloud increases during the annual meteor showers, especially the Geminids, because the lunar surface is exposed to the same stream of interplanetary dust particles. We expect all airless planetary objects to be immersed in similar tenuous clouds of dust.

Astronomy: A Mars-sized exoplanet

Astronomy News - 19 June 2015 - 10:00am

Astronomy: A Mars-sized exoplanet

Nature 522, 7556 (2015). doi:10.1038/522290a

Authors: Gregory Laughlin

Analysis of Kepler data has yielded the smallest known mass for an exoplanet orbiting a normal star. Its mass and size are similar to those of Mars, setting a benchmark for the properties of exoplanets smaller than Earth. See Letter p.321