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Mysterious glowing aurora over Saturn confounds scientists
A stunning light display over Saturn has stumped scientists who say it behaves unlike any other planetary aurora known in our solar system.
The blueish-green glow was found over the ringed planet's north polar region just like Earth's northern lights.
It was discovered by the infrared instruments on NASA's Cassini spacecraft.
'We've never seen an aurora like this elsewhere,' said Tom Stallard, a scientist working with Cassini data at the University of Leicester.
'This aurora covers an enormous area across the pole. Our current ideas on what forms Saturn's aurora predict that this region should be empty, so finding such a bright aurora here is a fantastic surprise.'
Auroras are caused by charged particles streaming along the magnetic field lines of a planet into its atmosphere.
Particles from the sun cause Earth's auroras. Many, but not all, of the auroras at Jupiter and Saturn are caused by particles trapped within the magnetic environments of those planets.
Jupiter's main auroral ring is caused by interactions in Jupiter's magnetic environment and remains constant in size. Saturn's main aurora is caused by the solar wind, and changes size dramatically as the wind varies. However, the newly observed aurora at Saturn doesn't fit into either category.
The new infrared aurora appears in a region hidden from NASA's Hubble Space Telescope. Cassini observed it when the spacecraft flew near Saturn's polar region.
In infrared light, the aurora sometimes fills the region from around 82 degrees north all the way over the pole. This new aurora is also constantly changing, even disappearing within a 45 minute-period.
'There is something special and unforeseen about this planet's magnetosphere and the way it interacts with the solar wind and the planet's atmosphere,' Cassini scientist Nick Achilleos from the University College London said.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency.
Ancient Rome rises from the ruins thanks to Google Earth
Ancient Rome has risen from the ruins thanks to a new version of Google Earth that lets you tour the city on your computer in 3D.
Visitors can explore the capital of the Roman Empire as it was in 320 AD - regarded by many historians as its heyday.
The three dimensional world - created by Google and available to download for free - lets users stand in the centre of the Forum, stroll across the arena of the Colosseum or fly through the Arch of Constantine.
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Each building has been carefully reconstructed and positioned using historical records, perfectly recreating the biggest and most important metropolis of the ancient world.
Google claims the site will be invaluable to historians, students and school children - as well as helping to bring the city to life for tourists.
Although some city centres such as San Francisco and Munich and famous landmarks have been recreated in three dimensions, this is the first time users have been able to walk around an ancient city.
Only 300 original ruins of the great capital are still standing today but Google created the computer model based on 6,700 buildings reconstructed by students and scholars from the time of Emperor Constantine - the first Roman Christian emperor. Pop-up 'information bubbles' provide extra detail at 250 sites around the ancient city.
Bernard Frische, director for the Institute of Advanced Technology in the Humanities at the University of Virginia who was involved in recreating the virtual Rome, said: 'The project is the continuation of five centuries of research by scholars, architects and artists since the Renaissance who have attempted to restore the ruins of the ancient city with words, maps and images.
'The partnership with Google Earth is another step in creating a virtual time machine which our children and grandchildren will use to study the history of Rome.'
Google joined forces with the Rome Reborn Project and Past Perfect Productions to create the computer graphics.
It is based on a physical model - the Plastico di Roma Antica - created by archaeologists and model makers between 1933 and 1974 and which is housed in a Roman museum.
The biggest building is the Colosseum - the elliptical amphitheatre at the heart of the city where Gladiatorial battles were fought for up to 80,000 spectators.
The model also reveals how Trajan's Column - a 125ft monument at the centre of the Forum - can be seen from across the city - and lets explorers tour Ludus Magnus - the gladiatorial training school.
The Mayor of Rome, Gianni Alemanno added: 'Ancient Rome 3D is a great opportunity to rediscover the importance of Ancient Roman culture, which is at the base of the Italian, European and, more generally, Western identities.'
More than 400 million people have downloaded Google Earth since it was launched in June, 2005.
