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I'm not sure a large planet would drop to background temperatures, but perhaps the temperatures would be as low as 20K. The outer planets have a complex atmosphere, but they all seem to be somewhat warmer than their respective moons.Or, is what we're seeing as "background radiation" actually the temperature signatures of matter? I suppose fissile material would generally be equally distributed between planets, moons, an asteroids (is that part of what causes the CMBR?) So for a free roaming planet to be distinguishable from the background, it would need an additional heat source other than fission.Anyway, it would seem as if there could be a great deal of non-luminous matter out there that isn't necessarily WIMPS.