or an extrinsic source (such as from past or recent collision with other objects). Radiation makes the detection of organic matter difficult, making its detection on atmosphereless objects closer to the Sun extremely difficult.

Examples of likely occurrences include:
* Tholins - many Trans Neptunian Objects including Pluto-Charon, Titan, Triton, Eris, Sedna, 28978 Ixion, 90482 Orcus, 24 Themis