Earth is the only planet that is known to support life. Almost two-thirds of Earth's surface is covered with water. It has a rocky terrain consisting of deep valleys and high mountains. Earth is neither too far nor too near to the Sun. This ensures that there is enough sunlight to maintain moderate temperatures on Earth. Which three factors would be most important for a body in the Solar System outside of Earth to support life?
My guess would be an energy source, water, and an atmosphere.
Explanation:
Whatever lives there is going to need energy and water to survive. The atmospheric layer will protect the planet like ours protects Earth. Hope this helps! :)