European probe wraps up 'Big Bang' survey

London, Jan 17 (ANI): A European space probe has completed its survey of the faintest remnants of light from the 'Big Bang' that created the Universe.

The High Frequency Instrument on ESA's Planck mission ran out of coolant on Saturday as expected, ending its ability to detect this faint energy.Planck has been a wonderful mission; spacecraft and instruments have been performing outstandingly well, creating a treasure trove of scientific data for us to work with," said Jan Tauber, ESA's Planck Project Scientist.

Less than half a million years after the Universe was created in the Big Bang 13.7 billion years ago, the fireball cooled to temperatures of about 4000 degree C, filling the sky with bright, visible light.

As the Universe has expanded, that light has faded and moved to microwave wavelengths.

By studying patterns imprinted in that light today, scientists hope to understand the Big Bang and the very early Universe, long before galaxies and stars first formed.

Planck has been measuring these patterns by surveying the whole sky with its High Frequency Instrument (HFI) and its Low Frequency Instrument (LFI).

Combined, they give Planck unparalleled wavelength coverage and the ability to resolve faint details.

Launched in May 2009, the minimum requirement for success was for the spacecraft to complete two whole surveys of the sky.

In the end, Planck worked perfectly for 30 months, about twice the span originally required, and completed five full-sky surveys with both instruments.

"This gives us even better data than we were expecting from the mission," said Jean-Loup Puget, Universite Paris Sud, Orsay, France, Principal Investigator of HFI.

Able to work at slightly higher temperatures than HFI, the LFI will continue surveying the sky for a large part of 2012, providing calibration data to improve the quality of the final results.

Planck sees not only the primordial microwaves from the Big Bang but also the emission from cold dust throughout the Universe.ore results from Planck will be announced next month, but the first results on the Big Bang and very early Universe will not come for another year.

Extremely careful and painstaking analysis of the data is needed to remove all of the contaminating foreground emission and tease out the faintest, most subtle signals in the remnant emission.

The results are widely anticipated because, despite two previous space missions to map this emission, there are still many competing ideas about what happened during the Big Bang.

"Planck's data will kill off whole families of models; we just don't know which ones yet," added Prof. Puget. (ANI)