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Planck satellite: Maps detail Universe's ancient light Planck satellite: Maps detail Universe's ancient light
(35 minutes later)
A spectacular new map of the "oldest light" in the sky has just been released by the European Space Agency.A spectacular new map of the "oldest light" in the sky has just been released by the European Space Agency.
Scientists say its mottled pattern is an exquisite confirmation of our Big-Bang model for the origin and evolution of the Universe.Scientists say its mottled pattern is an exquisite confirmation of our Big-Bang model for the origin and evolution of the Universe.
But there are features in the picture, they add, that are unexpected and will require ideas to be refined.But there are features in the picture, they add, that are unexpected and will require ideas to be refined.
The map was assembled from 15 months' worth of data acquired by the 600m-euro (£515m) Planck space telescope.The map was assembled from 15 months' worth of data acquired by the 600m-euro (£515m) Planck space telescope.
It details what is known as the cosmic microwave background, or CMB - a faint glow of microwave radiation that pervades all of space.It details what is known as the cosmic microwave background, or CMB - a faint glow of microwave radiation that pervades all of space.
Its precise configuration, visible in the new Planck data, is suggestive of a cosmos that is slightly older than previously thought - one that came into existence 13.82 billion years ago.Its precise configuration, visible in the new Planck data, is suggestive of a cosmos that is slightly older than previously thought - one that came into existence 13.82 billion years ago.
This is an increase of about 50 million years on earlier calculations.This is an increase of about 50 million years on earlier calculations.
The map's pattern also indicates a subtle adjustment is needed to the Universe's inventory of contents.The map's pattern also indicates a subtle adjustment is needed to the Universe's inventory of contents.
It seems there is slightly more matter out there (31.7%) and slightly less "dark energy" (68.3%), the mysterious component thought to be driving the cosmos apart at an accelerating rate.It seems there is slightly more matter out there (31.7%) and slightly less "dark energy" (68.3%), the mysterious component thought to be driving the cosmos apart at an accelerating rate.
Planck is the third western satellite to study the so-called Cosmic Microwave Background (CMB). Planck is the third western satellite to study the CMB. The two previous efforts - COBE and WMAP - were led by the US space agency (Nasa). The Soviets also had an experiment in space in the 1980s that they called Relikt-1.
The two previous efforts - COBE and WMAP - were led by the US space agency (Nasa). The Soviets also had an experiment in space in the 1980s that they called Relikt-1. The CMB is the light that was finally allowed to spread out across space once the Universe had cooled sufficiently to permit the formation of hydrogen atoms - about 380,000 years into the life of the cosmos.
The CMB is the light that was finally allowed to spread out across space once the Universe had cooled sufficiently to permit the formation of hydrogen atoms. It still bathes the Earth in a near-uniform glow at microwave frequencies, and has a temperature profile that is just 2.7 degrees above absolute zero.
Before that time, about 375,000 years into the life of the cosmos, conditions would have been so hot that all the light would have been bounced around and trapped in a fog of ionised matter. The Universe would have been opaque. But it is possible to detect minute deviations in this signal, and these fluctuations - seen as mottling in the map - are understood to reflect the differences in the density of matter when the light parted company and set out on its journey all those years ago.
The "fossil" light is still evident today. It bathes the Earth in a near-uniform glow which, thanks to the expansion of the Universe, can now be found at microwave frequencies. The fluctuations can be thought of as the seeds for all the structure that later developed in the cosmos - all the stars and galaxies.
Its average temperature profile is just 2.7 degrees above absolute zero, but it is possible to detect minute deviations from this signal. Scientists subject the temperature deviations to a range of statistical analyses, which can then be matched against theoretical expectations.
These fluctuations reflect the differences in the density of matter when the light parted company and set out on its journey. The subtle lumpiness, driven by gravity, would have seeded the later development of stars and galaxies. This allows them to rule in some models to explain the origin and evolution of the cosmos, while ruling out a host of others.
Greater capability The team that has done this for Planck's data says the map is an elegant fit for the standard model of cosmology - the idea that the Universe started in a hot, dense state in an incredibly small space, and then expanded and cooled.
COBE and WMAP extracted astonishing insights from the radiation. In addition to an age for the Universe, CMB studies have thrown up a refined estimate for the contents of the cosmos (4.6% atomic matter; 24% dark matter; and 71.4% dark energy) and an assessment of its geometry. At a fundamental level, it also supports an "add-on" to this Big Bang theory known as inflation, which postulates that in the very first moments of its existence the Universe opened up in an exponential manner - faster than light itself.
Scientists describe the Universe as being "flat", meaning space adheres to Euclidean rules, where straight lines can be extended to infinity and the angles of a triangle will add up to 180 degrees, etc. But because Planck's map is so much more detailed than anything previously obtained, it is also possible to see some anomalous features in it.
Planck has much higher sensitivity and resolution than either COBE or WMAP. One is the finding that the temperature fluctuations, when viewed across the biggest scales, do not match those predicted by the standard model. Their signal is a bit weaker than expected.
Cosmologists hope this improved capability will allow it to probe the light for evidence of "inflation", the faster than light expansion of the Universe that is postulated to have occurred in the first fractions of a second after the Big Bang. Also, there appears also to be an asymmetry in the average temperatures across the sky; the southern hemisphere is slightly warmer than the north.
Inflation has been a popular add-on to Big Bang theory since the 1980s. A third significant anomaly is a cold spot in the map, centred on the constellation Eridanus, which is much bigger than would be predicted.
These features have been hinted at before by Planck's most recent predecessor - Nasa's WMAP satellite - but are now seen with greater clarity and their significance cemented.
A consequence will be the binning of many ideas for how inflation propagated, as the process was first introduced in the 1980s as a way to iron out such phenomena.
The fact that these delicate features are real will force theorists to finesse their inflationary solutions and possibly even lead them to some novel physics on the way.
Jonathan.Amos-INTERNET@bbc.co.uk and follow me on Twitter: @BBCAmosJonathan.Amos-INTERNET@bbc.co.uk and follow me on Twitter: @BBCAmos