Ok so a few days ago I played around on Universe Sandbox and discovered that if two planets orbited close enough to each other in a binary system, the tidal forces of their orbit could create enough heat to counteract the heat loss from radiation, and be able to support liquid water even with the absence of a star.
If such a system were to appear, however unlikely, wouldn't it be possible for life to actually develop in these exoplanetary systems?
The only downside to this is the massive earthquakes that would common, but in a way, that could probably increase the likelihood of life because of the geothermal activity.

Do you lads think this has any merit? I'd love some criticism.