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A Sedna-like body with a perihelion of 80 astronomical units

Astronomy News - 26 March 2014 - 1:00am

A Sedna-like body with a perihelion of 80 astronomical units

Nature 507, 7493 (2014). doi:10.1038/nature13156

Authors: Chadwick A. Trujillo & Scott S. Sheppard

The observable Solar System can be divided into three distinct regions: the rocky terrestrial planets including the asteroids at 0.39 to 4.2 astronomical units (au) from the Sun (where 1 au is the mean distance between Earth and the Sun), the gas giant planets at 5 to 30 au from the Sun, and the icy Kuiper belt objects at 30 to 50 au from the Sun. The 1,000-kilometre-diameter dwarf planet Sedna was discovered ten years ago and was unique in that its closest approach to the Sun (perihelion) is 76 au, far greater than that of any other Solar System body. Formation models indicate that Sedna could be a link between the Kuiper belt objects and the hypothesized outer Oort cloud at around 10,000 au from the Sun. Here we report the presence of a second Sedna-like object, 2012 VP113, whose perihelion is 80 au. The detection of 2012 VP113 confirms that Sedna is not an isolated object; instead, both bodies may be members of the inner Oort cloud, whose objects could outnumber all other dynamically stable populations in the Solar System.

Rosetta:Payload commissioning underway

Astronomy News - 25 March 2014 - 10:11pm
The re-commissioning of Rosetta's science instruments is now in its second week, and while our operations and science teams are busy with those activities, we have a quick status report on the general health of the spacecraft going into the commissioning period.

Big bang breakthrough: Who is the father of inflation?

Astronomy News - 25 March 2014 - 9:22pm
Like the Higgs boson, the theory of an inflating early universe has many daddies – partly because it draws on disparate ideas in physics and cosmology
    





Space-time ripples hint at physics beyond the big bang

Astronomy News - 25 March 2014 - 9:22pm
Gravitational waves could help us sift through many visions for the rapid expansion of the early universe – or offer even wilder views of cosmic birth
    





Hubble:New artwork unveiled at the Science with the Hubble Space Telescope IV conference [heic1407]

Astronomy News - 25 March 2014 - 9:55am
Last week researchers from around the world gathered at the Accademia dei Lincei in Rome for the Science with the Hubble Space Telescope IV conference. The event celebrated the history of Hubble's extraordinary achievements, and looked to the future at what might yet be achieved and how the James Webb Space Telescope will build on our knowledge of the Universe. As part of this celebration artist Tim Otto Roth revealed a new artwork, Heaven's Carousel, inspired by Hubble's work on the accelerating expansion of the Universe.

Stellar stuff: outreach programme brings Gaia into schools

Astronomy News - 24 March 2014 - 10:00am

Will Gaia discover habitable planets similar to the Earth? Is the Universe infinite? Could Gaia be hit by a piece of space debris as in the film Gravity? How many planets are there in the Milky Way?

Children often ask the best questions. These ones come from pupils at schools in Italy, France, Poland and the UK. Their requests for information about space and our Universe are just some of the dozens of questions that will be answered tomorrow by top space scientists as part of a live event. The online Q&A session will link a total of more than 70 institutions across Europe in an ambitious initiative designed to engage school pupils in the excitement of astronomy in general and the science of the Gaia programme, in particular.

Tomorrow’s event is the culmination of an educational outreach project, called Gaia Live in School, which connects more than 2,000 children at 34 schools with leading European space research institutions. The project has been conceived and coordinated by Dr Nicholas Walton, a research fellow at Cambridge University’s Institute of Astronomy, coordinator of the Gaia Research for European Astronomy Training network, and the UK member of the European Space Agency (ESA) Gaia Science Team.

The queries and responses will be filmed by a professional crew at ESA’s European Space Operations Centre (ESOC) in Darmstadt, Germany, and streamed live to the schools involved via a dedicated livestream channel. Responding to the children’s questions will be the Gaia project scientist, Dr Timo Prusti, and the Gaia spacecraft manager, David Milligan. Both are key members of the team at ESA, responsible for Gaia as it embarks on its five-year mission to map a billion stars in our Milky Way.

“Gaia is set to provide the most complete 3-D map of our Galaxy, and allow astronomers to, for instance, directly measure Dark Matter in our galaxy, unravel the formation history of the Milky Way, search for new extra-solar planets, and much more,” said Walton.

“We hope tomorrow will be a fun day for everyone and show children how their everyday mathematics and science can be applied to cutting edge space missions.

The schools taking part in the event are spread right across Europe – from the Canary Islands, Spain in the south to Finland in the north. Each school is linked to a research institute in its area and each one will benefit from two post graduate students from that institute, who will be present in the classroom to work with teachers and act as ‘explainers’. The event has been designed to appeal to children aged around 12, an age when children are mature enough to grasp quite tricky concepts and also extremely open to new ideas.

The ‘explainers’ have all benefited from a training course at ESA’s space technology centre (ESTEC) where they learned how to present advanced scientific content to school-aged children in an accessible way. Teachers from the participating schools have met with the ‘explainers’, to gain information about the background, capabilities and mission of Gaia, enabling them to explain to their pupils what the programme is setting out to achieve and how the international team behind it has been created.

Two Cambridgeshire secondary schools – Parkside Community College and Cottenham Village College – are taking part in Gaia Live in School. Cambridge University PhD student, Iulia Simion, will spend the day with year-7 pupils at Parkside. She said: “We will explore our ‘neighbourhood’ by looking at the general properties of the Solar System and the Milky Way and we will talk about the Gaia mission - introducing the concept of parallax, fundamental for understanding how Gaia estimates distances - using hands-on demonstrations, videos and the live connection to  ESOC.”

Simion, who is doing her PhD on the structure of the Milky Way, says that her interest in astronomy started when she was very young. She explained: “As a child growing up in Romania and Italy I had many books with ‘pretty’ pictures of planets, galaxies, supernovae and comets. I did not particularly like physics at that time, but understanding the scientific mechanisms behind those beautiful images proved, as I got older, to be very rewarding and has led me to become an astronomer."

Walton’s research looks at the structure of the Universe at the largest scales through the study of Supernova, and nearer by in the Milky Way utilising large area imaging surveys to map the galactic plane. For him, the momentum to learn more about the cosmos also came at an early age. He remembers the excitement when the first probes landed on Mars, and beamed those pictures of the red planet back to Earth, and seeing these images at an after-school physics club at secondary school.

The ‘Gaia Live’ Q&As will be accompanied by film clips and the latest astronomical images of the Milky Way and our Solar System to enliven and illustrate the points discussed about the Gaia mission. The session will be followed by demonstrations of how to get involved in the science of space exploration in a hands-on way, such as how to build your own telescope, how Gaia measures the distances to stars just by taking pictures of the sky (using parallax), and how to create your own model of Gaia.

“We hope that the Gaia Live event will inspire a large number of the next generation of scientists, some of whom might well lead the next wave of astronomical and space discovery in future years,” said Walton.

Inset images: David Milligan, Gaia Spacecraft Operations Manager (ESA/J Mai); Iulia Simion.

 

A Cambridge-led outreach project is connecting over 2,200 pupils with the excitement of ESA’s Gaia mission through a Q&A session that will take place tomorrow with the discussion streamed live to schools throughout Europe. 

universespaceEuropean Space Agency (ESA)Gaiamilky waygalaxyastronomyNicholas WaltonIulia SimionInstitute of AstronomySchool of Physical SciencesWe want the pupils to see for themselves how European centres are working together on this space project that will revolutionise our knowledge of the Milky Way and the Universe more generally.Nicholas WaltonESA–S. Corvaja, 2013Soyuz VS06, with Gaia space observatory, lifted off from Europe's Spaceport, French Guiana, on 19 December 2013

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YesNews type: News

Doubt cast on evidence for wet Moon

Astronomy News - 22 March 2014 - 3:50pm
Scientists have cast doubt on a major part of the case for the Moon having once held abundant water.

Rosetta's instruments come alive

Astronomy News - 21 March 2014 - 3:28pm
After its near three-year, deep-space hibernation, the comet-chasing Rosetta probe begins testing its science payload.

VIDEO: Searching for the Northern Lights

Astronomy News - 21 March 2014 - 10:49am
BBC Weather's Carol Kirkwood looks at what causes the Northern Lights and tries to see them in the UK.

Moon impacts eject debris at shotgun speeds

Astronomy News - 20 March 2014 - 11:03pm
The risk to future lunar explorers is significant but manageable, provided we build strong enough spacesuits and moon bases
    





NASA's Spitzer Telescope Brings 360-Degree View of Galaxy to Our Fingertips

Astronomy News - 20 March 2014 - 5:00pm
Touring the Milky Way now is as easy as clicking a button with NASA's new zoomable, 360-degree mosaic presented Thursday at the TEDActive 2014 Conference in Vancouver, Canada.

Salty skies signal planetary growing pains

Astronomy News - 19 March 2014 - 10:13pm
Thick, steamy atmospheres full of mineral vapours would reveal young planets that have just suffered huge collisions like the ones that helped make Earth
    

Will new physics sail on gravitational waves?

Astronomy News - 19 March 2014 - 7:30pm
The discovery of primordial ripples in space-time is exciting. But does it really herald a new era for cosmology?
    





Gravitational waves explained with a towel and apple

Astronomy News - 19 March 2014 - 4:27pm
Need a giant IQ to understand the announcement about gravitational waves? Nonsense. Our video explains the basics using nothing but everyday objects
    





Multiverse gets real with glimpse of big bang ripples

Astronomy News - 18 March 2014 - 6:39pm
The first direct signs of a cosmic growth spurt that set space-time rippling means that we may live in just one of an infinite number of universes
    





NASA Releases First Interactive Mosaic of Lunar North Pole

Astronomy News - 18 March 2014 - 5:00pm
Scientists, using cameras aboard NASA's Lunar Reconnaissance Orbiter (LRO), have created the largest high resolution mosaic of our moon’s north polar region. The six-and-a-half feet (two-meters)-per-pixel images cover an area equal to more than one-quarter of the United States.

'Waves' detected on Titan’s lakes

Astronomy News - 18 March 2014 - 3:27pm
Scientists believe they have detected liquid waves on Saturn’s moon Titan – the first to be observed on the surface of another world.

AUDIO: Hawking 'wins inflation debate'

Astronomy News - 18 March 2014 - 10:34am
Tom Feilden, Stephen Hawking and Neil Turok discuss new evidence that scientists claim supports a Big Bang Theory for the origin of the Universe.

Herschel:Herschel completes largest survey of cosmic dust in local Universe

Astronomy News - 18 March 2014 - 9:52am
The largest census of dust in local galaxies has been completed using data from ESA's Herschel space observatory, providing a huge legacy to the scientific community.

Swirls of colour reveal primordial gravitational waves

Astronomy News - 17 March 2014 - 5:08pm
This visualisation of eddies in cosmic background radiation gives a glimpse into the moments after the big bang