They are headed for the L2 Lagrangian point a million miles in the direction from Earth that is opposite to the Sun, where they will be relatively free of gravitational influences.
Herschel is an infrared telescope.
http://www.guardian.co.uk/science/video/2009/may/14/herschel-space-telescope-infrared-esa
Planck is to observe the cosmic background radiation in microwave.
http://www.guardian.co.uk/science/2009/may/14/herschel-planck-esa-space-telescopes
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