it shows the satellite Herschel reflected in the mirror of the satellite Planck, which will (hopefully!) be launched next week, sharing the same rocket. that's why i actually found the picture totally sweet!Herschel will observe the sky in the infrared, whereas Planck will scan it in the microwave, focussing on the CMB (cosmic microwave background), ie. the relic signature coming from the big bang.
ok, maybe it's a bit confusing... if infrared and microwave don't tell you much, check the next post for clarification. and check this blog soon for more about the CMB and Planck...
Image credits: ESA
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