Answer:

1.

It has to be a comfortable distance away from a star (Habitable Zone)

The stars around it have to be 'stable'.

It should not have a very low mass.

It must rotate on its axis and revolve.

It should have a molten core.

It should hold an atmosphere.

2.It is the right distance from the Sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atmosphere, and it has the right chemical ingredients for life, including water and carbon.