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Uploaded on May 6, 2009
When did galaxies form? How did it happen? Were they like galaxies we see today? Did stars form first and then get together to form galaxies, or was it the other way round? Astronomers dream of a telescope able to answer these kinds of questions, and ESA's Herschel could be the one to just that. With its 3.5-metre mirror, able to see far-infrared light, Herschel will mark the beginning of a new generation of 'space giants'.