ESA's Planck satellite builds on Nobel-prize-winning science

Oct 04, 2006
ESA's Planck satellite
Image shows telescope at the top containing two mirrors encased by a shield. The thicker base is the service module. Credits: ESA 2002. Illustration by Medialab

The 2006 Nobel Prize for physics has been awarded to Americans John C. Mather and George F. Smoot for their work on NASA's 1989 Cosmic Background Explorer (COBE) satellite. In 2008, ESA's Planck satellite will be launched and will build on this award-winning legacy by showing cosmologists new details of the Universe's origins.

COBE cemented the Big Bang theory of the Universe's origins but it could not answer every question. In some ways, it raised more than it answered, leaving cosmologists hungry to explore the details of how the Universe began. ESA's Planck satellite will help answer these questions.

As COBE did, Planck will look back to the dawn of time and observe the most ancient radiation in the Universe: the cosmic microwave background (CMB). Planck will do so with the most sensitive instruments ever brought to bear on this ancient radiation from space, the best place from which to make such observations.

"The Nobel committee's recognition of Mather and Smoot reinforces the fundamental importance of research into the microwave background radiation. With Planck, ESA looks forward to taking this research to a new level of detail," says Jan Tauber, Planck Project Scientist.

ESA's Planck satellite builds on Nobel-prize-winning science
The Cosmic Microwave Background comes from everywhere with (almost) the same intensity. This was confirmed by the COBE satellite, which measured (almost) the same temperature of 2.7 degree Kelvin everywhere on the sky. However, the very existence of other galaxies points to the fact that there should be very small changes in the measured 'temperature' of the CMB. These changes, or fluctuations, would have provided the seeds for the formation of the galaxies that we see today. Planck will be able to measure these tiny fluctuations. Indeed it will be able to distinguish temperature differences of 5 millionths of a degree! Credits: ESA

Whereas COBE convincingly confirmed that the Universe was born out of superheated primordial gas, Planck will look to understand the fundamental structure and components of the infant Universe, and for the details of how giant clusters of galaxies, and even individual galaxies, formed out of the initial fireball.

Building on the legacy of COBE, and NASA's follow-on mission WMAP, Planck will also investigate whether the Universe suffered a period of sudden exponential expansion, termed Inflation, shortly after the Big Bang. It will do this by surveying the whole sky, looking for subtle temperature variations in the CMB from place to place. The temperature variations betray regions of different density in the early Universe. High-density regions eventually became the galaxies and clusters of galaxies we see in the Universe today.

To achieve its goals, Planck has been designed to have ten times better instantaneous sensitivity and more than fifty times the angular resolution of COBE; these quantities taken together make Planck about one thousand times more powerful than COBE.

Source: ESA

Explore further: Precise ages of largest number of stars hosting planets ever measured

Related Stories

Enormous hole in the universe may not be the only one

Apr 22, 2015

Astronomers have found evidence of a giant void that could be the largest known structure in the universe. The "supervoid" solves a controversial cosmic puzzle: it explains the origin of a large and anomalou ...

Recommended for you

What is the habitable zone?

8 hours ago

The weather in your hometown is downright uninhabitable. There's scorching heatwaves, annual tyhpoonic deluges, and snow deep enough to bury a corn silo.

Galaxy survey to probe why the universe is accelerating

9 hours ago

We know that our universe is expanding at an accelerating rate, but what causes this growth remains a mystery. The most likely explanation is that a strange force dubbed "dark energy" is driving it. Now a ...

High resolution far-infrared all-sky image data release

10 hours ago

A research group led by a University of Tokyo researcher, using the AKARI satellite's Far-Infrared All-Sky data, have created all-sky image maps and released the full database to researchers around the world ...

The discovery of the molecule Si-C-Si in space

Jun 29, 2015

The space between stars is not empty—it contains a vast reservoir of diffuse material with about 5-10% of the total mass of our Milky Way galaxy. Most of the material is gas, but about 1% of this mass (quite ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.