A European Space Agency (ESA) Ariane 5 rocket has launched the European space telescopes Planck and Herschel from French Guiana.
Planck's objective is to analyse with the highest accuracy yet the cosmic microwave background created immediately after the Big Bang.
The Herschel Space Observatory, originally called the Far Infrared and Sub-millimeter Telescope, has the largest single mirror with a diameter of 3.5 meters in a space telescope. The mirror is designed to collect long-wavelength radiation from some of the coldest and most distant objects in the Universe. Herschel is the only space observatory to cover the spectral range from the far infrared to sub-millimetre.
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