  We provide a simple but very useful description of the process of wormhole
formation. We place two massive objects in two parallel universes (modeled by
two branes). Gravitational attraction between the objects competes with the
resistance coming from the brane tension. For sufficiently strong attraction,
the branes are deformed, objects touch and a wormhole is formed. Our
calculations show that more massive and compact objects are more likely to
fulfill the conditions for wormhole formation. This implies that we should be
looking for wormholes either in the background of black holes and compact
stars, or massive microscopic relics. Our formation mechanism applies equally
well for a wormhole connecting two objects in the same universe.
