The energy required to reach escape velocity generally precludes a planet from generating enough force to fling an object outside its gravity well. The energy

The energy required to reach escape velocity generally precludes a planet from generating enough force to fling an object outside its gravity well. The energy required to sustain life generally precludes large lifeforms from surviving for long periods in space on a spacerock. Anything that evolved into a complex organism probably required a stable source of energy for billions of years. Ours is the sun, and at a very specific distance range.