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Planck Telescope Snaps First Images

Planck Telescope Snaps First Images
One of Planck's first images is shown as a strip superimposed over a two-dimensional projection of the whole sky as seen in visible light. The strip covers 360-degrees of sky and, at its widest, is about 15 degrees across. The prominent horizontal band is light from our Milky Way galaxy.
(Image: © ESA, LFI & HFI Consortia, Background optical image: Axel Mellinger)

The Planck mission has captured its first rough images ofthe sky, as part of its mission to measure light from the dawn of time.

Planck ? a European Space Agency mission with NASAparticipation ? will surveythe entire sky to learn more about the history and evolution of ouruniverse.

The space telescope started surveying the sky regularly onAug. 13 from its vantage point far from Earth. Planck is in orbit around thesecond Lagrange point of our Earth-sun system, a relatively stable spot located930,000 miles (1.5 million kilometers) away from Earth.

"We are beginning to observe ancient light that hastraveled more than 13 billion years to reach us," said Charles Lawrence,the NASA project scientist for the mission at NASA's Jet Propulsion Laboratoryin Pasadena, Calif. "It's tremendously exciting to see these very firstdata from Planck. They show that all systems are working well and give apreview of the all-sky images to come."

Following launch on May 14 (along with its siblingspacecraft Herschel), the satellite's subsystems were checked out inparallel with the cool-down of its instruments' detectors. The detectors arelooking for temperature variations in the cosmic microwave background, whichconsists of microwaves from the early universe. The temperature variations area million times smaller than one degree.

To achieve this precision, Planck's detectors have beencooled to extremelylow temperatures, some of them very close to the lowest temperaturetheoretically attainable.

During the "first-light" survey, which took placefrom Aug. 13 to 27, Planck surveyed the sky continuously. It was carried out toverify the stability of the instruments and the ability to calibrate them overlong periods to the exquisite accuracy needed.

The survey yielded maps of a strip of the sky, one for eachof Planck's nine frequencies. Preliminary analysis indicates that the qualityof the data is excellent.

Over the next 15 months, Planck will gather data for twofull independent all-sky maps.

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